Model index
A growing library across macroeconomics, microeconomics, and econometrics.
The catalog is organized around two lanes: Marimo-first models for most equation-driven teaching apps, including the new econometrics notebooks, and a reserved native-JS lane for the rare cases that need highly bespoke interaction.
Growth, business cycles, and open economy
Macroeconomics
Exogenous growth foundations
Solow-Swan Growth Model
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
Ramsey-Cass-Koopmans Model
Explore how preferences, technology, and depreciation alter the steady state and the planner's optimal transition path using a shooting algorithm.
Deterministic business-cycle dynamics
Basic Real Business Cycle Model
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
Stochastic RBC Model with AR(1) Shocks
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
Basic New Keynesian DSGE Model
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
Diamond Overlapping-Generations Model
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
AK Endogenous Growth Model
Change technology, saving, and policy wedges to see how the growth rate of capital, output, and consumption can remain permanently elevated.
Advanced macroeconomics
Small Open Economy Model
Explore how productivity shifts, world interest rates, and impatience shape consumption, external borrowing, and the current account over time.
Intermediate macroeconomics
IS-LM and the AD-AS Model
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
The Expectations-Augmented Phillips Curve
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
Microeconomics
Intermediate price theory
Supply and Demand Equilibrium
Track how intercepts and shocks shift equilibrium price, quantity, and total surplus in a competitive market.
Intermediate price theory
Per-Unit Tax Incidence
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
Price Ceilings and Price Floors
Switch between ceilings and floors to see when the policy binds, how traded quantity changes, and where welfare losses come from.
Intermediate price theory
Elasticity and Tax Incidence
Compare how buyer and seller tax shares move as demand or supply becomes more or less elastic.
Advanced microeconomics
Consumer Choice and Indifference Curves
Adjust tastes, prices, and income to compare interior and corner solutions, then track how optimal bundles and indirect utility move.
Advanced microeconomics
Competitive Firm and Cost Curves
Move productivity, fixed costs, and output prices to see how marginal cost, average cost, and profit-maximizing output respond.
Intermediate firm theory
Monopoly and Deadweight Loss
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
Kinked Demand and Price Rigidity
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
Monopsony and the Minimum Wage
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
Externalities and the Pigouvian Tax
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
2x2 Normal-Form Game
Change payoffs to see how best-response maps, equilibrium outcomes, and strategic tension shift across familiar 2x2 games.
Regression, identification, and simulated evidence
Econometrics
Upper-undergraduate econometrics
Simple OLS Regression
Adjust the data-generating process and watch the fitted line, coefficient estimates, and residual behavior move with noise, slope, and sample size.
Upper-undergraduate econometrics
Omitted Variable Bias
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
Difference-in-Differences
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
Instrumental Variables
See when IV improves on OLS, when weak instruments make the estimate unstable, and how exclusion violations undermine the design.