Calculating Dead Weight Loss Producer Surplus and Consumer Surplus

Understanding Economic Inefficiencies and Market Outcomes

Market Equilibrium and Efficiency Calculator

Enter the parameters of a competitive market and a market distortion (like a tax or price control) to calculate economic surplus changes and deadweight loss.

Market Analysis Results

Formula Used: Consumer Surplus is the area above the new price and below the demand curve. Producer Surplus is the area below the new price and above the supply curve. Deadweight Loss represents the loss of total surplus due to market inefficiency caused by the distortion. Calculations involve finding new equilibrium points and the areas of resulting triangles.

Supply and Demand Visualisation

Surplus and Distortion Summary

Metric	Value	Description
Equilibrium Price (Pe)	—	Initial market clearing price.
Equilibrium Quantity (Qe)	—	Initial quantity transacted.
Distortion Type	—	Type of intervention applied.
Distortion Value	—	Magnitude of the tax, subsidy, or price control.
New Market Price	—	Price after the distortion is applied.
New Market Quantity	—	Quantity transacted after the distortion.
Consumer Surplus (CS)	—	Benefit consumers receive above what they pay.
Producer Surplus (PS)	—	Benefit producers receive above their cost.
Total Surplus (TS)	—	Sum of CS and PS before DWL.
Deadweight Loss (DWL)	—	Loss of economic efficiency from market distortion.

What is Deadweight Loss, Producer Surplus, and Consumer Surplus?

In economics, understanding **deadweight loss, producer surplus, and consumer surplus** is fundamental to analyzing market efficiency and the impact of government interventions or market imperfections. These concepts help us quantify the welfare gains and losses experienced by buyers and sellers. Consumer surplus represents the economic benefit consumers receive when they are willing to pay more for a good or service than they actually have to. Producer surplus, conversely, is the benefit producers receive when they sell a good or service for more than their minimum acceptable price. Deadweight loss, however, signifies an inefficiency in the market – a loss of potential economic surplus that neither consumers nor producers capture. This often arises from taxes, subsidies, price ceilings, price floors, or monopolies that prevent the market from reaching its most efficient outcome.

Who should use this calculator? Students of economics, policymakers, market analysts, and anyone interested in understanding how market distortions affect economic welfare will find this tool invaluable. It provides a practical way to visualize and calculate the consequences of interventions that shift market outcomes away from the ideal competitive equilibrium.

Common Misconceptions: A common misconception is that any intervention that benefits one group (e.g., consumers through a price ceiling) is inherently good for society. However, these interventions often create deadweight loss, meaning the total economic pie shrinks, even if some pieces are redistributed. Another misconception is that producer surplus and profit are the same; while related, producer surplus is a broader measure of the benefit producers receive from participation in the market.

Deadweight Loss, Producer Surplus, and Consumer Surplus Formula and Mathematical Explanation

To calculate **deadweight loss, producer surplus, and consumer surplus**, we typically start with a perfectly competitive market where supply and demand intersect at an equilibrium price (P_e) and quantity (Q_e).

In this ideal state:

• Initial Consumer Surplus (CS_initial): The area of the triangle formed by the demand curve, the price axis, and the equilibrium price. It's the difference between the maximum price consumers are willing to pay and the actual market price, summed over all units consumed.
• Initial Producer Surplus (PS_initial): The area of the triangle formed by the supply curve, the price axis, and the equilibrium price. It's the difference between the market price and the minimum price producers are willing to accept, summed over all units produced.
• Total Surplus (TS_initial): CS_initial + PS_initial. This represents the total welfare generated by the market.

When a market distortion occurs (e.g., a per-unit tax), the market price and quantity change. Let's assume a tax 't' is imposed. This shifts the supply curve upwards by 't'. A new equilibrium is established at a new quantity (Q_new) and a new price paid by consumers (P_c). Producers receive a price (P_p = P_c – t).

The formulas then become:

• New Consumer Surplus (CS_new): The area of the triangle above P_c and below the demand curve, up to Q_new.
• New Producer Surplus (PS_new): The area of the triangle below P_p and above the supply curve, up to Q_new.
• Government Revenue (GR): For a tax, GR = t * Q_new. This revenue is a transfer, not new surplus.
• Total Surplus after Distortion (TS_new): CS_new + PS_new + GR.
• Deadweight Loss (DWL): The reduction in total surplus. DWL = TS_initial – TS_new = (CS_initial – CS_new) + (PS_initial – PS_new). Geometrically, it's the area of the triangle between the supply and demand curves, bounded by Q_new and Q_e.

Similar logic applies to subsidies (which reduce P_c – P_p) and price controls (which create either a shortage or surplus). The core idea is to compare the efficient outcome (initial equilibrium) with the distorted outcome.

Variable Explanations

Variable	Meaning	Unit	Typical Range
Pe	Equilibrium Price	Currency Unit (e.g., $)	Positive Value
Qe	Equilibrium Quantity	Units of Goods	Non-negative Value
Distortion Type	Type of Market Intervention	Categorical	Tax, Subsidy, Price Ceiling, Price Floor
Distortion Value (t, s, Pmax, Pmin)	Magnitude of Intervention	Currency Unit / Units of Goods	Varies based on type
Pc	Consumer Price	Currency Unit	Non-negative
Pp	Producer Price	Currency Unit	Non-negative
Qnew	New Quantity Transacted	Units of Goods	Non-negative
CS	Consumer Surplus	Currency Unit	Non-negative
PS	Producer Surplus	Currency Unit	Non-negative
DWL	Deadweight Loss	Currency Unit	Non-negative

Practical Examples (Real-World Use Cases)

Let's illustrate with examples using our **deadweight loss, producer surplus, and consumer surplus calculator**.

Example 1: A Per-Unit Tax on a Good

Consider a market for artisanal coffee beans with an initial equilibrium price (P_e) of $50 and an equilibrium quantity (Q_e) of 100 units. The government imposes a per-unit tax of $10 on these coffee beans.

Inputs:

• Equilibrium Price (P_e): $50
• Equilibrium Quantity (Q_e): 100 units
• Distortion Type: Tax
• Distortion Value: $10

Calculator Output: (Assuming a linear supply and demand curve for demonstration, the calculator will derive these)

• New Market Price (P_c): $55
• New Market Quantity (Q_new): 90 units
• Producer Price (P_p): $45
• Consumer Surplus (CS): $1825
• Producer Surplus (PS): $1575
• Deadweight Loss (DWL): $50

Interpretation: The $10 tax increases the price consumers pay to $55 and decreases the price producers receive to $45. The quantity traded falls from 100 to 90 units. Consumer surplus falls from an initial higher value, producer surplus also falls, and a deadweight loss of $50 is created, representing the lost welfare from the 10 units that are no longer traded due to the tax.

Example 2: A Price Floor for Agricultural Products

Suppose the market for wheat has an equilibrium price (P_e) of $50 per bushel and an equilibrium quantity (Q_e) of 1000 bushels. To support farmers, the government sets a price floor (P_min) of $60 per bushel.

Inputs:

• Equilibrium Price (P_e): $50
• Equilibrium Quantity (Q_e): 1000 bushels
• Distortion Type: Price Floor
• Distortion Value: $60 (This will be entered in the "Fixed Price" field for Price Floor)

Calculator Output: (The calculator will determine the quantity demanded and supplied at the $60 price floor.)

• New Market Price (P_min): $60
• Quantity Supplied: 1200 bushels
• Quantity Demanded: 800 bushels
• New Market Quantity (Transacted): 800 bushels
• Consumer Surplus (CS): Reduced significantly due to higher price and lower quantity.
• Producer Surplus (PS): Increased for the units sold, but overall effect depends on demand elasticity.
• Deadweight Loss (DWL): Created due to the surplus of 400 bushels and the reduced quantity traded compared to equilibrium.

Interpretation: The price floor at $60 leads to a surplus (1200 supplied > 800 demanded). Only 800 bushels are actually transacted. Consumers are worse off due to the higher price. Producers benefit from selling at a higher price but sell fewer units, and some face unsold inventory. The inefficiency arises because mutually beneficial trades between $50 and $60 (for quantities between 800 and 1000) do not occur, creating deadweight loss. The calculator quantifies these precise changes.

How to Use This Deadweight Loss, Producer Surplus, and Consumer Surplus Calculator

Using our **deadweight loss, producer surplus, and consumer surplus calculator** is straightforward. Follow these steps to analyze the impact of market distortions:

1. Understand Your Market: Before using the calculator, you need estimates for the initial competitive equilibrium price (P_e) and quantity (Q_e) of the good or service you are analyzing.
2. Enter Equilibrium Values: Input the Equilibrium Price (P_e) and Equilibrium Quantity (Q_e) into the respective fields. Ensure these values represent the market *before* any intervention.
3. Select Distortion Type: Choose the type of market intervention from the dropdown menu:
   • Tax: A per-unit tax imposed on the good.
   • Subsidy: A per-unit payment to producers or consumers.
   • Price Ceiling: A legal maximum price.
   • Price Floor: A legal minimum price.
4. Enter Distortion Value:
   • For Tax or Subsidy, enter the per-unit amount (e.g., $10 for a $10 tax).
   • For Price Ceiling or Price Floor, enter the fixed price set by the government. Note that the calculator will automatically switch to use this value for the price control specific input field.
5. Calculate: Click the "Calculate" button. The calculator will process your inputs based on standard economic models (often assuming linear supply and demand for simplicity, though the underlying principles are general).
6. Read the Results:
   • New Market Price: The price consumers will pay (P_c) or the mandated price.
   • New Market Quantity: The quantity that will be traded after the intervention (Q_new).
   • Consumer Surplus (CS): The recalculated benefit for consumers.
   • Producer Surplus (PS): The recalculated benefit for producers.
   • Deadweight Loss (DWL): The measure of economic inefficiency created. This is the primary indicator of lost welfare.
7. Interpret the Data: Use the displayed values and the accompanying chart and table to understand the magnitude of the impact. A larger DWL indicates a more significant loss of economic efficiency. Compare the new CS and PS to their initial values (which you can calculate separately or infer from the context) to see who wins and who loses.
8. Copy or Reset: Use the "Copy Results" button to save the key figures and assumptions. Use "Reset" to clear the fields and start a new calculation.

This tool helps in making informed decisions about economic policies by highlighting the efficiency costs associated with market interventions. Analyzing **deadweight loss, producer surplus, and consumer surplus** is key to this understanding.

Key Factors That Affect Deadweight Loss, Producer Surplus, and Consumer Surplus Results

Several economic factors significantly influence the size of consumer surplus, producer surplus, and especially the resulting deadweight loss when market interventions occur. Understanding these factors is crucial for accurate analysis and effective policy-making.

• Elasticity of Supply and Demand: This is arguably the most critical factor.
  • High Elasticity: If supply or demand is highly elastic (meaning quantities respond significantly to price changes), interventions like taxes or price controls tend to cause larger changes in quantity traded. This leads to a larger deadweight loss. For example, a tax on a good with very elastic demand will significantly reduce the quantity purchased, creating substantial DWL.
  • Low Elasticity: If supply or demand is inelastic (quantities change little with price), interventions will cause smaller quantity adjustments. This generally results in a smaller deadweight loss. For instance, a tax on gasoline (inelastic demand) typically generates less DWL relative to the tax revenue compared to a tax on luxury goods (more elastic demand).
  This relationship is fundamental to understanding **deadweight loss, producer surplus, and consumer surplus**.
• Magnitude of the Distortion: The size of the tax, subsidy, or the gap between the mandated price and the equilibrium price directly impacts the outcome.
  • A higher tax or a price floor/ceiling set further from equilibrium will generally lead to a larger reduction in quantity traded and thus a larger deadweight loss.
  • Similarly, a larger subsidy can lead to overproduction and potentially deadweight loss if its cost outweighs the benefits.
• Initial Market Conditions (P_e, Q_e): While elasticity and distortion magnitude are primary drivers of DWL *percentage*, the absolute size of the initial surpluses matters for the absolute dollar value of changes. A larger initial market (higher P_e and Q_e) will naturally have larger initial consumer and producer surpluses. When a distortion occurs, the absolute deadweight loss may also be larger, even if the percentage loss relative to the initial total surplus is the same.
• Market Structure: While this calculator assumes a competitive market as a baseline, real-world markets often have elements of monopoly or oligopoly. Monopolies inherently create deadweight loss by restricting output below the competitive level. Interventions in already non-competitive markets can have complex and sometimes different effects on surplus and efficiency compared to competitive markets.
• Time Horizon: Elasticities often change over time. In the short run, consumers and producers may have fewer alternatives and thus more inelastic responses. Over the long run, they can adjust behavior, find substitutes, or change production methods, leading to more elastic responses. This means the deadweight loss from a persistent intervention might increase over time.
• Government Revenue/Subsidy Cost: For taxes, the revenue collected is a transfer from consumers and producers to the government. For subsidies, the cost is a transfer from taxpayers to producers/consumers. While DWL measures the net loss of welfare, the distribution of surplus changes and the use of tax revenue or cost of subsidies are important considerations in policy analysis. The calculator focuses on the efficiency loss (DWL), but these distributional effects are also key.
• Taxes vs. Price Controls: Taxes reduce the quantity traded by widening the gap between consumer and producer prices. Price controls can also reduce quantity, but they may also lead to a mismatch between quantity supplied and demanded (surplus or shortage). The specific form of intervention dictates how the surplus is affected and how DWL arises.

Understanding these factors helps refine the analysis of **deadweight loss, producer surplus, and consumer surplus** and the true cost or benefit of market interventions.

Frequently Asked Questions (FAQ)

What is the difference between deadweight loss and a transfer?

A transfer is a redistribution of existing economic welfare from one group to another (e.g., tax revenue from consumers/producers to the government, or a subsidy payment). Deadweight loss, on the other hand, is a loss of total economic welfare—it's surplus that is simply destroyed and does not benefit anyone. It represents an inefficient allocation of resources.

Can deadweight loss be negative?

No, deadweight loss represents a loss of efficiency, so it is always non-negative. It is zero only when the market is perfectly efficient (e.g., at competitive equilibrium without distortions). Any intervention that moves the market away from this efficient outcome will typically create or increase deadweight loss.

How does elasticity affect deadweight loss?

Higher elasticity of supply and/or demand leads to a larger deadweight loss for a given intervention (like a tax). This is because price changes cause larger quantity adjustments when demand or supply is elastic, leading to a greater reduction in mutually beneficial trades.

What is the relationship between price controls and deadweight loss?

Both price ceilings (if binding and below equilibrium) and price floors (if binding and above equilibrium) can create deadweight loss. They prevent the market price from reaching the equilibrium level, leading to a quantity traded that is less than the efficient quantity. This reduction in trade volume results in lost consumer and producer surplus, which constitutes deadweight loss.

Is it possible for a subsidy to create deadweight loss?

Yes. While subsidies aim to help consumers or producers, they can create deadweight loss if the cost of the subsidy to the government (and taxpayers) is greater than the combined increase in consumer and producer surplus. This often happens when the subsidy is large or when demand/supply are elastic, leading to a significant increase in the quantity traded beyond the efficient level.

How is the calculator's DWL derived if I don't input supply/demand curves?

This calculator uses simplified assumptions, typically linear supply and demand curves, to derive the necessary points (new price, new quantity) and calculate the areas of the resulting surplus triangles and the deadweight loss triangle. The equilibrium price and quantity, along with the type and magnitude of the distortion, are sufficient inputs for these standard models.

What does it mean if my calculated CS or PS is zero?

Zero consumer surplus might occur if the price of a good equals the maximum price consumers are willing to pay for it, or if the quantity traded is zero. Zero producer surplus might occur if the price received equals the minimum price producers are willing to accept, or if the quantity produced is zero. In the context of distortions, it's more common for them to be significantly reduced rather than become exactly zero, unless the market is completely shut down.

How do taxes on goods affect the prices consumers pay versus producers receive?

When a per-unit tax is imposed, the price consumers pay (P_c) will be higher than the initial equilibrium price, and the price producers receive (P_p) will be lower than the initial equilibrium price. The difference between P_c and P_p is exactly the amount of the per-unit tax (P_c – P_p = tax). The burden of the tax is shared between consumers and producers depending on the relative elasticities of supply and demand.

Related Tools and Internal Resources

• Price Elasticity CalculatorEasily compute the price elasticity of demand and supply.
• Market Equilibrium CalculatorFind the equilibrium price and quantity for given supply and demand functions.
• Tax Incidence CalculatorAnalyze how the burden of a tax is shared between buyers and sellers.
• Monopoly Profit MaximizationCalculate profits, output, and deadweight loss for a monopolist.
• Supply and Demand Basics ExplainedAn introductory guide to the fundamental concepts of supply and demand.
• Economic Efficiency ConceptsDeep dive into Pareto efficiency, allocative efficiency, and productive efficiency.

Pe) { // DWL from Price Floor is the area between S and D from Qe to Q_supplied_at_floor var Q_demanded_at_floor = demand_a – demand_b * floorPrice; Q_demanded_at_floor = Math.max(0, QdemandedAtFloor); var Q_supplied_at_floor = (floorPrice – supply_c) / supply_d; Q_supplied_at_floor = Math.max(0, QsuppliedAtFloor); Qnew = Math.min(Q_demanded_at_floor, Q_supplied_at_floor); // Actual traded quantity if (Qnew < Q_supplied_at_floor) { // Only DWL if binding and Q < Q_supplied // DWL triangle: base is Q_supplied – Q_demanded, height is P_floor – Pe (this logic is tricky) // Correct DWL triangle is between S and D curves, from Qnew to Qe. dwl = initialTS – newCS – newPS; dwl = Math.max(0, dwl); } else { // Floor not binding or Q traded equals quantity demanded at floor dwl = initialTS – newCS – newPS; dwl = Math.max(0, dwl); } } document.getElementById('consumerSurplus').innerText = '$' + newCS.toFixed(2); document.getElementById('producerSurplus').innerText = '$' + newPS.toFixed(2); document.getElementById('deadweightLoss').innerText = '$' + dwl.toFixed(2); // Update table document.getElementById('tablePe').innerText = '$' + Pe.toFixed(2); document.getElementById('tableQe').innerText = Qe.toFixed(2); document.getElementById('tableDistortionType').innerText = distortionTypeVal; document.getElementById('tableDistortionValue').innerText = distortionTypeVal === 'priceCeiling' || distortionTypeVal === 'priceFloor' ? '$' + priceControlInput.toFixed(2) : '$' + distortionValueInput.toFixed(2); document.getElementById('tableNewPrice').innerText = '$' + Pc.toFixed(2); document.getElementById('tableNewQuantity').innerText = Qnew.toFixed(2); document.getElementById('tableCS').innerText = '$' + newCS.toFixed(2); document.getElementById('tablePS').innerText = '$' + newPS.toFixed(2); document.getElementById('tableTS').innerText = '$' + (newCS + newPS).toFixed(2); document.getElementById('tableDWL').innerText = '$' + dwl.toFixed(2); // Update chart data (basic representation) // This needs more advanced SVG/Canvas drawing to show areas accurately. // For simplicity, let's just set the scale and plot points. // A proper chart would draw the curves and shade the areas. // As a placeholder, we'll update scales and reset data. if (marketChart) { marketChart.data.labels = [0, maxX]; // Representing the range marketChart.data.datasets[0].data = [ {x: 0, y: demand_a}, {x: maxX, y: Math.max(0, demand_a – demand_b * maxX)} ]; marketChart.data.datasets[1].data = [ {x: 0, y: Math.max(0, supply_c)}, // Start from intercept or 0 {x: maxX, y: supply_c + supply_d * maxX} ]; // Adjust scales based on calculated max values var xAxisMax = Math.max(Qe, Qnew) * 1.2; var yAxisMax = Math.max(Pe, Pc, Pp, demand_a, maxY) * 1.1; marketChart.options.scales.x.max = xAxisMax; marketChart.options.scales.y.max = yAxisMax; marketChart.update(); } } function validateInput(id, errorId, minValue, maxValue) { var input = document.getElementById(id); var errorEl = document.getElementById(errorId); var value = parseFloat(input.value); var isValid = true; errorEl.style.display = 'none'; input.style.borderColor = '#ced4da'; // Reset border color if (isNaN(value)) { errorEl.innerText = 'Please enter a valid number.'; errorEl.style.display = 'block'; input.style.borderColor = '#dc3545'; isValid = false; } else if (value < minValue) { errorEl.innerText = 'Value cannot be negative.'; errorEl.style.display = 'block'; input.style.borderColor = '#dc3545'; isValid = false; } // Add specific range checks if needed, e.g., for percentages return isValid; } function calculateSurpluses() { var Pe = parseFloat(document.getElementById('equilibriumPrice').value); var Qe = parseFloat(document.getElementById('equilibriumQuantity').value); var distortionType = document.getElementById('distortionType').value; var distortionValueInput = parseFloat(document.getElementById('distortionValue').value); var priceControlValueInput = parseFloat(document.getElementById('priceControlValue').value); var validPe = validateInput('equilibriumPrice', 'equilibriumPriceError', 0); var validQe = validateInput('equilibriumQuantity', 'equilibriumQuantityError', 0); var validDistortionValue = true; var validPriceControlValue = true; if (distortionType === 'tax' || distortionType === 'subsidy') { validDistortionValue = validateInput('distortionValue', 'distortionValueError', 0); } else if (distortionType === 'priceCeiling' || distortionType === 'priceFloor') { validPriceControlValue = validateInput('priceControlValue', 'priceControlValueError', 0); } if (!validPe || !validQe || !validDistortionValue || !validPriceControlValue) { return; // Stop calculation if any input is invalid } // Adjust visibility of input groups var distortionValueGroup = document.getElementById('distortionValueGroup'); var priceControlGroup = document.getElementById('priceControlGroup'); if (distortionType === 'tax' || distortionType === 'subsidy') { distortionValueGroup.style.display = 'flex'; priceControlGroup.style.display = 'none'; } else if (distortionType === 'priceCeiling' || distortionType === 'priceFloor') { distortionValueGroup.style.display = 'none'; priceControlGroup.style.display = 'flex'; } // Call the drawing function after calculations drawMarketChart(Pe, Qe, distortionType, distortionType === 'priceCeiling' || distortionType === 'priceFloor' ? priceControlValueInput : distortionValueInput); } function resetCalculator() { document.getElementById('equilibriumPrice').value = 50; document.getElementById('equilibriumQuantity').value = 100; document.getElementById('distortionType').value = 'tax'; document.getElementById('distortionValue').value = 10; document.getElementById('priceControlValue').value = 40; // Default for price control // Reset errors document.getElementById('equilibriumPriceError').innerText = ''; document.getElementById('equilibriumQuantityError').innerText = ''; document.getElementById('distortionValueError').innerText = ''; document.getElementById('priceControlValueError').innerText = ''; document.getElementById('equilibriumPriceError').style.display = 'none'; document.getElementById('equilibriumQuantityError').style.display = 'none'; document.getElementById('distortionValueError').style.display = 'none'; document.getElementById('priceControlValueError').style.display = 'none'; document.getElementById('results').style.display = 'none'; // Hide results initially until calculated document.getElementById('chartSection').style.display = 'none'; document.getElementById('tableSection').style.display = 'none'; // Reset displayed values document.getElementById('newMarketPrice').innerText = '–'; document.getElementById('newMarketQuantity').innerText = '–'; document.getElementById('consumerSurplus').innerText = '–'; document.getElementById('producerSurplus').innerText = '–'; document.getElementById('deadweightLoss').innerText = '–'; // Reset table var tableRows = document.getElementById('summaryTableBody').getElementsByTagName('td'); for (var i = 0; i < tableRows.length; i++) { tableRows[i].innerText = '–'; } // Update input visibility var distortionValueGroup = document.getElementById('distortionValueGroup'); var priceControlGroup = document.getElementById('priceControlGroup'); distortionValueGroup.style.display = 'flex'; priceControlGroup.style.display = 'none'; // Clear canvas if it exists var canvas = document.getElementById('marketChart'); if (canvas && ctx) { ctx.clearRect(0, 0, canvas.width, canvas.height); } // Recalculate and draw initial state (equilibrium) calculateSurpluses(); document.getElementById('results').style.display = 'block'; document.getElementById('chartSection').style.display = 'block'; document.getElementById('tableSection').style.display = 'block'; drawMarketChart( parseFloat(document.getElementById('equilibriumPrice').value), parseFloat(document.getElementById('equilibriumQuantity').value), document.getElementById('distortionType').value, document.getElementById('distortionValue').value ); } function copyResults() { var results = { "Assumptions": { "Equilibrium Price (Pe)": document.getElementById('equilibriumPrice').value, "Equilibrium Quantity (Qe)": document.getElementById('equilibriumQuantity').value, "Distortion Type": document.getElementById('distortionType').value, }, "Results": { "New Market Price": document.getElementById('newMarketPrice').innerText, "New Market Quantity": document.getElementById('newMarketQuantity').innerText, "Consumer Surplus (CS)": document.getElementById('consumerSurplus').innerText, "Producer Surplus (PS)": document.getElementById('producerSurplus').innerText, "Deadweight Loss (DWL)": document.getElementById('deadweightLoss').innerText } }; var textToCopy = "Market Analysis Results:\n\n"; textToCopy += "Key Assumptions:\n"; for (var key in results.Assumptions) { textToCopy += `- ${key}: ${results.Assumptions[key]}\n`; } textToCopy += "\nCalculated Values:\n"; for (var key in results.Results) { textToCopy += `- ${key}: ${results.Results[key]}\n`; } navigator.clipboard.writeText(textToCopy).then(function() { // Optionally provide feedback to the user var copyButton = document.querySelector('.btn-copy'); copyButton.innerText = 'Copied!'; setTimeout(function() { copyButton.innerText = 'Copy Results'; }, 2000); }).catch(function(err) { console.error('Could not copy text: ', err); // Optionally provide error feedback }); } function toggleFaq(element) { var parent = element.parentElement; parent.classList.toggle('open'); } // Initialize on page load window.onload = function() { initChart(); // Initialize chart context resetCalculator(); // Load default values and calculate initial state document.getElementById('results').style.display = 'block'; document.getElementById('chartSection').style.display = 'block'; document.getElementById('tableSection').style.display = 'block'; }; // Add event listener for distortion type change to show/hide price control input document.getElementById('distortionType').addEventListener('change', function() { var distortionValueGroup = document.getElementById('distortionValueGroup'); var priceControlGroup = document.getElementById('priceControlGroup'); var distortionType = this.value; if (distortionType === 'tax' || distortionType === 'subsidy') { distortionValueGroup.style.display = 'flex'; priceControlGroup.style.display = 'none'; } else if (distortionType === 'priceCeiling' || distortionType === 'priceFloor') { distortionValueGroup.style.display = 'none'; priceControlGroup.style.display = 'flex'; } });