Your earnings for each round will be calculated in two parts:

• Private Earnings: The amount kept in your Private Account.
• Group Earnings: The total amount contributed to the Group Account by all ${N} members is multiplied by ${a.toFixed(1)}. This total is then distributed equally among all ${N} members, regardless of their contribution.

Your total payoff for the round is:

`; // MPR Information html += `

• Every ${currencyUnit} you contribute yields a private return of ${symbol}${a.toFixed(2)}.
• The group earns ${symbol}${a.toFixed(2) * N} for every ${currencyUnit} contributed.
• If everyone contributes their full endowment, the highest possible round payoff is ${symbol}${maxIndividualReturn.toFixed(2)}.
• The maximum possible total return to the group is ${symbol}${maxGroupReturn.toFixed(2)}.

`; // Advanced Rules if (punishmentCheckbox.checked) { html += `

After contributions are revealed, you will enter a punishment stage. You may spend ${symbol}1 to deduct ${symbol}3 from another player's earnings. This stage is costly to both parties but allows for enforcing cooperation.

`; } if (monitoringCheckbox.checked) { html += `

Before or during the contribution phase, you will have access to a communication channel to discuss strategies with your group. The actions of individuals will be ${monitoringCheckbox.checked ? 'partially observable' : 'fully anonymous'}.

`; } previewContent.innerHTML = html; } // --- Event Listeners and Initialization --- function setupListeners() { // Attach update function to all inputs ALL_INPUTS.forEach(input => { input.addEventListener(input.type === 'checkbox' ? 'change' : 'input', generateRulesetPreview); }); pdfBtn.addEventListener('click', downloadPDF); generateRulesetPreview(); // Initial load } // --- PDF Generation --- function downloadPDF() { if (typeof window.jspdf === 'undefined' || typeof window.jspdf.jsPDF === 'undefined') { alert('Error: jsPDF library not loaded.'); return; } const { jsPDF } = window.jspdf; const doc = new jsPDF(); const margin = 40; const pageWidth = doc.internal.pageSize.getWidth(); let currentY = margin; // Ensure data is fresh generateRulesetPreview(); const formData = validateAndParseInputs(); const projectName = projectNameInput.value.trim() || 'Public Goods Game'; const currencySymbol = currencyLabelInput.value.trim() === 'Dollars' ? '$' : ''; const unit = currencyLabelInput.value.trim(); const symbol = currencySymbol || ''; // --- Document Header --- doc.setFontSize(20); doc.setFont('helvetica', 'bold'); doc.text(`${projectName} Ruleset`, pageWidth / 2, currentY, { align: 'center' }); currentY += 15; doc.setFontSize(14); doc.setFont('helvetica', 'normal'); doc.text(`Official Rules for Experiment`, pageWidth / 2, currentY, { align: 'center' }); currentY += 25; // --- Parameters Table --- doc.setFontSize(12); doc.setFont('helvetica', 'bold'); doc.text("Experiment Parameters", margin, currentY); currentY += 5; const paramData = [ ["Group Size (N):", formData.N.toString(), "Initial Endowment (E):", `${symbol}${formData.E}`], ["MPR (a):", formData.a.toFixed(2), "Total Rounds:", formData.T.toString()], ["Currency Unit:", unit, "Grouping:", partneringCheckbox.checked ? 'Fixed (Partnering)' : 'Random (Strangers)'], ]; doc.autoTable({ startY: currentY, body: paramData, theme: 'striped', styles: { cellPadding: 3, fontSize: 10 }, columnStyles: { 0: { fontStyle: 'bold', fillColor: [240, 253, 245] }, 2: { fontStyle: 'bold', fillColor: [240, 253, 245] } } }); currentY = doc.autoTable.previous.finalY + 20; // --- Ruleset Content --- doc.setFontSize(12); doc.setFont('helvetica', 'bold'); // Rule 1: Introduction doc.text("1. Introduction", margin, currentY); currentY += 15; doc.setFont('helvetica', 'normal'); let text = `This experiment consists of ${formData.T} rounds, played in anonymous groups of ${formData.N} participants. You will play with the same ${formData.N} participants for all ${formData.T} rounds. (${partneringCheckbox.checked ? 'Fixed Groups' : 'Randomly re-shuffled'}).`; let lines = doc.splitTextToSize(text, pageWidth - margin * 2); doc.text(lines, margin, currentY); currentY += lines.length * 12 + 10; // Rule 2: Endowment and Contribution doc.setFont('helvetica', 'bold'); doc.text("2. Endowment & Contribution", margin, currentY); currentY += 15; doc.setFont('helvetica', 'normal'); text = `At the start of each round, you receive ${symbol}${formData.E} ${unit}. You must decide how much (from ${symbol}0 to ${symbol}${formData.E}) to contribute to a Group Account. The amount you do not contribute remains in your Private Account.`; lines = doc.splitTextToSize(text, pageWidth - margin * 2); doc.text(lines, margin, currentY); currentY += lines.length * 12 + 10; // Rule 3: Payoff Calculation doc.setFont('helvetica', 'bold'); doc.text("3. Payoff Calculation", margin, currentY); currentY += 15; doc.setFont('helvetica', 'normal'); text = `Your earnings for each round are calculated as: Private Earnings + Group Earnings. Group Earnings: The total group contribution is multiplied by ${formData.a.toFixed(1)}. This amount is distributed equally among all ${formData.N} members.`; lines = doc.splitTextToSize(text, pageWidth - margin * 2); doc.text(lines, margin, currentY); currentY += lines.length * 12 + 10; // Formula Box if (currentY + 30 > doc.internal.pageSize.getHeight() - margin) { doc.addPage(); currentY = margin; } doc.setFont('courier', 'normal'); doc.setDrawColor(5, 150, 105); doc.setFillColor(236, 253, 245); doc.rect(margin, currentY, pageWidth - margin * 2, 40, 'FD'); doc.setTextColor(30, 41, 59); doc.text(`Payoff = (E - C\u1D62) + ( ${formData.a.toFixed(1)} \u00D7 \u03A3C\u1D62 )`, margin + 10, currentY + 20); currentY += 50; // Rule 4: Advanced Options (if selected) doc.setFont('helvetica', 'bold'); if (punishmentCheckbox.checked) { if (currentY + 30 > doc.internal.pageSize.getHeight() - margin) { doc.addPage(); currentY = margin; } doc.text("4. Punishment Stage", margin, currentY); currentY += 15; doc.setFont('helvetica', 'normal'); text = `After contributions, you may spend ${symbol}1 to deduct ${symbol}3 from another player's earnings. This is costly to both.`; lines = doc.splitTextToSize(text, pageWidth - margin * 2); doc.text(lines, margin, currentY); currentY += lines.length * 12 + 10; } if (monitoringCheckbox.checked) { if (currentY + 30 > doc.internal.pageSize.getHeight() - margin) { doc.addPage(); currentY = margin; } doc.setFont('helvetica', 'bold'); doc.text("5. Information Access", margin, currentY); currentY += 15; doc.setFont('helvetica', 'normal'); text = `Communication is enabled to coordinate strategy. The actions of individuals will be publicly observable.`; lines = doc.splitTextToSize(text, pageWidth - margin * 2); doc.text(lines, margin, currentY); currentY += lines.length * 12 + 10; } doc.save('public-goods-ruleset.pdf'); } setupListeners(); });