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Price Elasticity of Demand Calculator
Elasticity: —
const p1 = document.getElementById(“p1”);
const p2 = document.getElementById(“p2”);
const q1 = document.getElementById(“q1”);
const q2 = document.getElementById(“q2”);
const result = document.getElementById(“result”);
function calculateElasticity() {
const p1Val = parseFloat(p1.value);
const p2Val = parseFloat(p2.value);
const q1Val = parseFloat(q1.value);
const q2Val = parseFloat(q2.value);
if (p1Val > 0 && p2Val > 0 && q1Val > 0 && q2Val > 0) {
const changeQ = (q2Val – q1Val) / q1Val;
const changeP = (p2Val – p1Val) / p1Val;
const elasticity = changeQ / changeP;
if (!isNaN(elasticity) && isFinite(elasticity)) {
result.textContent = `Elasticity: ${elasticity.toFixed(2)}`;
} else {
result.textContent = “Elasticity: —”;
}
} else {
result.textContent = “Elasticity: —”;
}
}
// Auto calculate on input
document.getElementById(“pedForm”).addEventListener(“input”, calculateElasticity);
// Google Analytics event tracking on input focus
document.querySelectorAll(“#pedForm input”).forEach(input => {
input.addEventListener(“focus”, function() {
if (typeof gtag === “function”) {
gtag(‘event’, ‘input_focus’, {
‘event_category’: ‘Price Elasticity Calculator’,
‘event_label’: this.id
});
}
});
});
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