Model index
The catalogue uses two complementary lanes: fast, indexable native TypeScript/SVG diagrams for direct interaction, and Python/Marimo notebooks for equation-heavy depth. Hybrid pages combine both by leading with the native diagram and retaining the full notebook.
Guided study
Follow a curated sequence, or jump to the step that matches your current knowledge.
5 steps
Move from capital accumulation and optimal saving into technology shocks and sticky-price policy.
7 steps
Build from competitive markets and intervention to consumer choice, firm decisions, and monopoly power.
5 steps
Start with regression and confounding, then compare three canonical identification strategies.
Explore all models
Try a broader concept or reset the discovery controls.
Growth, business cycles, and open economy
Exogenous growth foundations
Use the sliders to compare current outcomes with the golden rule, inspect the Solow diagram, and see how capital accumulation converges over time.
Optimal growth with endogenous saving
Trace the saddle path through the (k, c) phase plane instantly, fire permanent-shock experiments, then open the notebook for the discrete-time shooting derivation.
Deterministic business-cycle dynamics
Change preferences, technology, depreciation, and shock size to see how a one-period TFP disturbance propagates through a closed economy with endogenous saving.
Persistent business-cycle dynamics
Vary shock persistence, innovation volatility, and core preference parameters to see how a stochastic TFP process generates realised paths and sample moments for output, consumption, and investment.
Sticky-price business-cycle dynamics
Adjust Phillips-curve slope, intertemporal demand sensitivity, policy-rule coefficients, and shock persistence to see how inflation, the output gap, and interest rates respond.
Advanced macroeconomics
Study the steady state, compare it with the golden-rule benchmark, and see when an economy may overaccumulate capital and become dynamically inefficient.
Advanced macroeconomics
Change technology, saving, and policy wedges to see how the growth rate of capital, output, and consumption can remain permanently elevated.
Advanced macroeconomics
Explore how productivity shifts, world interest rates, and impatience shape consumption, external borrowing, and the current account over time.
Intermediate macroeconomics
See how aggregate demand is derived from IS-LM, then apply demand and supply shocks and watch the short-run equilibrium animate back to potential output.
Intermediate macroeconomics
Set the unemployment rate the central bank tries to hold and watch what happens to inflation: stable at the natural rate, accelerating below it, disinflating above it.
Price theory to strategic interaction
Intermediate price theory
Track how intercepts and shocks shift equilibrium price, quantity, and total surplus in a competitive market.
Intermediate price theory
See how a per-unit tax alters prices on both sides of the market and divides the burden between buyers and sellers.
Intermediate price theory
Switch between ceilings and floors to see when the policy binds, how traded quantity changes, and where welfare losses come from.
Intermediate price theory
Compare how buyer and seller tax shares move as demand or supply becomes more or less elastic.
Advanced microeconomics
Adjust tastes, prices, and income to compare interior and corner solutions, then track how optimal bundles and indirect utility move.
Advanced microeconomics
Move productivity, fixed costs, and output prices to see how marginal cost, average cost, and profit-maximising output respond.
Intermediate firm theory
Compare a monopolist's price and output to the competitive benchmark, and read off profit and deadweight loss as you reshape demand and cost.
Intermediate oligopoly
See why oligopoly prices are sticky: the kink in demand opens a gap in marginal revenue, and any marginal cost inside the gap leaves price and output at the kink.
Intermediate firm theory
See how a monopsonist marks the wage down below the marginal product, and how a minimum wage between the monopsony and competitive wage raises both employment and pay.
Intermediate price theory
See why a market with an external cost or benefit misses the social optimum, and tune a corrective tax or subsidy until the deadweight loss disappears.
Advanced microeconomics
Change payoffs to see how best-response maps, equilibrium outcomes, and strategic tension shift across familiar 2x2 games.
Regression, identification, and simulated evidence
Upper-undergraduate econometrics
Adjust the true intercept, slope, noise, and sample size to relate realised estimates to fit, slope estimation error, and an approximate 95% slope interval.
Upper-undergraduate econometrics
Change confounding strength and the omitted variable's effect to compare the true coefficient, the naive regression, and the fully controlled benchmark.
Upper-undergraduate econometrics
Adjust treatment effects, group gaps, noise, and trend violations to see exactly when the DiD estimate matches the truth and when it drifts.
Upper-undergraduate econometrics
See when IV improves on OLS, when weak instruments make the estimate unstable, and how exclusion violations undermine the design.
Intermediate causal inference
See how a discontinuity identifies a causal effect: fit a line each side of the cutoff and read the vertical jump between them, then watch the bandwidth trade bias against noise.
Intermediate econometrics
Drag the persistence parameter through one and watch a stationary, mean-reverting series become a random walk and then explosive — while the sample ACF tracks the theoretical geometric decay φᵏ.
