Resources are scarce, people want more than there is, and every choice forecloses\nanother. Economics exists to reason about how individuals, firms, and societies\nmake those choices and what happens when they collide through markets, prices,\nand institutions. The economist's reason for being is to predict behavior and\nevaluate policy without a laboratory — to figure out what causes what when the\nclean experiment is rarely available, and to keep everyone honest about the cost\nof options that look free. Almost every important decision, from a central bank's\nrate to a school's budget, rests on a claim about how people will respond, and\nmost such claims are wrong in predictable ways.
\n","wordCount":110},{"heading":"Core Mission","id":"core-mission","markdown":"Identify the real cause of an outcome and the true cost of a choice — counting\nwhat doesn't happen as carefully as what does — so that decisions rest on\nincentives and evidence rather than intentions and anecdote.","html":"Identify the real cause of an outcome and the true cost of a choice — counting\nwhat doesn't happen as carefully as what does — so that decisions rest on\nincentives and evidence rather than intentions and anecdote.
\n","wordCount":36},{"heading":"Primary Responsibilities","id":"primary-responsibilities","markdown":"The visible work is models and regressions; the actual work is disciplined causal\nreasoning under scarcity. An economist spends their days framing a question as a\nchoice at the margin, specifying what people trade off and how they respond to\nincentives, building a model simple enough to reason with, confronting the\nidentification problem that separates correlation from causation, exploiting\nvariation to estimate a counterfactual, and translating it all into a\nrecommendation that survives the question \"compared to what?\" Forecasting and the\nconstant defense against confounders run underneath everything.","html":"The visible work is models and regressions; the actual work is disciplined causal\nreasoning under scarcity. An economist spends their days framing a question as a\nchoice at the margin, specifying what people trade off and how they respond to\nincentives, building a model simple enough to reason with, confronting the\nidentification problem that separates correlation from causation, exploiting\nvariation to estimate a counterfactual, and translating it all into a\nrecommendation that survives the question "compared to what?" Forecasting and the\nconstant defense against confounders run underneath everything.
\n","wordCount":88},{"heading":"Guiding Principles","id":"guiding-principles","markdown":"- **Think at the margin, not the average.** Decisions are made one more unit at a\n time. The question is never \"is education good?\" but \"is *this* additional\n dollar of it worth more than its next-best use?\"\n- **People respond to incentives.** Show me the incentive and I'll show you the\n outcome. Every policy changes the payoffs people face, and they reoptimize —\n often around your intent.\n- **Every choice has an opportunity cost.** The cost of anything is what you give\n up to get it. There are no free options, only options whose cost is hidden.\n- **Correlation is not causation, and proving causation is the whole job.** Most\n observed relationships are confounded; obsess over identification before\n interpretation, and judge a policy only against an explicit counterfactual — the\n world that would have happened otherwise.\n- **Equilibrium, not just impact.** Trace the effect after everyone adjusts, not\n just the first-round bump; sunk costs are sunk, and partial-equilibrium\n intuitions mislead.","html":"Economists rarely work alone on questions that matter. They lean on statisticians\nand data scientists for inference, policy analysts and political scientists to\ntranslate findings into feasible institutions, and financial analysts and traders\nwho apply the same equilibrium and expected-value logic to markets in real time.\nThe recurring friction sits between the cleanly identified estimate and the messy\ndecision: a policymaker wants a yes/no answer, and the honest economist owes them\nthe effect size, its uncertainty, and the assumptions holding it up.
\n","wordCount":84},{"heading":"Ethics","id":"ethics","markdown":"Economists wield quiet influence: a recommended discount rate or elasticity can\nmove billions. The first duty is to separate positive from normative — what *is*\nfrom what *ought to be* — and to flag when a value judgment has entered. Report\nuncertainty honestly rather than launder a preferred conclusion through a\nconfident point estimate, and disclose who funds the work and what they want it\nto show. Distributional effects deserve to be named, not buried under aggregate\nefficiency, because the people who lose from an efficient policy are real. And\nthere is the duty of humility: the model is a simplification and the forecast is\nconditional, and overstating either is its own kind of harm.","html":"Economists wield quiet influence: a recommended discount rate or elasticity can\nmove billions. The first duty is to separate positive from normative — what is\nfrom what ought to be — and to flag when a value judgment has entered. Report\nuncertainty honestly rather than launder a preferred conclusion through a\nconfident point estimate, and disclose who funds the work and what they want it\nto show. Distributional effects deserve to be named, not buried under aggregate\nefficiency, because the people who lose from an efficient policy are real. And\nthere is the duty of humility: the model is a simplification and the forecast is\nconditional, and overstating either is its own kind of harm.
\n","wordCount":113},{"heading":"Scenarios","id":"scenarios","markdown":"**Evaluating a minimum-wage increase.** The naive read compares employment before\nand after and blames any job loss on the wage. The economist instead asks for the\ncounterfactual: what would employment have done anyway? They reach for a\ndifference-in-differences design — a state that raised its wage versus a neighbor\nthat didn't, differencing out the common trend — or a border discontinuity where\ntwo counties differ only in the law. They check that parallel trends hold,\nestimate the wage elasticity of employment, and report a range, not a verdict,\nthen trace the general-equilibrium response: do firms cut hours, raise prices, or\nsubstitute capital?\n\n**A \"free\" infrastructure project.** A mayor calls a new bridge free because it's\nfederally funded. The economist counts the opportunity cost — the next-best use of\nthe money and land — against the marginal benefit (time saved times traffic times\nvalue of time), discounted to present value. If marginal benefit undershoots\nmarginal cost, the project destroys value no matter who writes the check. They\nalso flag induced demand: build it and people re-optimize their commutes, eroding\nthe congestion relief.\n\n**An insurance market unraveling.** Premiums spike, healthy customers drop out,\nthe average risk of those who remain rises, and premiums climb again. The\neconomist diagnoses an adverse-selection death spiral driven by asymmetric\ninformation, then evaluates remedies by their incentive effects: a mandate keeps\ngood risks in the pool, risk-rating prices them honestly — each with its own\ndeadweight cost.","html":"Evaluating a minimum-wage increase. The naive read compares employment before\nand after and blames any job loss on the wage. The economist instead asks for the\ncounterfactual: what would employment have done anyway? They reach for a\ndifference-in-differences design — a state that raised its wage versus a neighbor\nthat didn't, differencing out the common trend — or a border discontinuity where\ntwo counties differ only in the law. They check that parallel trends hold,\nestimate the wage elasticity of employment, and report a range, not a verdict,\nthen trace the general-equilibrium response: do firms cut hours, raise prices, or\nsubstitute capital?
\nA "free" infrastructure project. A mayor calls a new bridge free because it's\nfederally funded. The economist counts the opportunity cost — the next-best use of\nthe money and land — against the marginal benefit (time saved times traffic times\nvalue of time), discounted to present value. If marginal benefit undershoots\nmarginal cost, the project destroys value no matter who writes the check. They\nalso flag induced demand: build it and people re-optimize their commutes, eroding\nthe congestion relief.
\nAn insurance market unraveling. Premiums spike, healthy customers drop out,\nthe average risk of those who remain rises, and premiums climb again. The\neconomist diagnoses an adverse-selection death spiral driven by asymmetric\ninformation, then evaluates remedies by their incentive effects: a mandate keeps\ngood risks in the pool, risk-rating prices them honestly — each with its own\ndeadweight cost.
\n","wordCount":243},{"heading":"Related Occupations","id":"related-occupations","markdown":"The economist shares the quantitative temperament of several fields but is defined\nby causal reasoning about choice under scarcity. Statisticians supply the\ninferential machinery, though economists prize identification over pure\nprediction. Data scientists optimize forecast accuracy where economists chase\ncausal effects and structural parameters. Financial analysts and traders apply\nequilibrium and expected-value reasoning to asset prices in real time. Policy\nanalysts turn the estimates into feasible programs, and political scientists study\nthe institutions economic incentives run through.","html":"The economist shares the quantitative temperament of several fields but is defined\nby causal reasoning about choice under scarcity. Statisticians supply the\ninferential machinery, though economists prize identification over pure\nprediction. Data scientists optimize forecast accuracy where economists chase\ncausal effects and structural parameters. Financial analysts and traders apply\nequilibrium and expected-value reasoning to asset prices in real time. Policy\nanalysts turn the estimates into feasible programs, and political scientists study\nthe institutions economic incentives run through.
\n","wordCount":78},{"heading":"References","id":"references","markdown":"- *The Wealth of Nations* — Adam Smith\n- *The General Theory of Employment, Interest and Money* — Keynes\n- *Mostly Harmless Econometrics* — Angrist & Pischke\n- *Principles of Economics* — N. Gregory Mankiw\n- *The Use of Knowledge in Society* — Friedrich Hayek","html":"