Activity

Added a new lecture, Gradual Liberalization in a Global Production Network, and extended Institution Building Without Commitment.

Add gradual_liberalization_network lecture and extend organizational_equilibrium #399

Added two new lectures, Gradualism in Self-Enforcing Trade Agreements and Institution Building Without Commitment.

Add gradual_trade_agreements and organizational_equilibrium lectures #396

Added two new lectures, Policy Counterfactuals in a New Keynesian Economy and Invertibility and Policy Counterfactuals, and revised three related lectures on policy counterfactuals and induced priors.

Add policy_invertibility and policy_counterfactuals_nk and revise McKay–Wolf lectures #394

Revised Linear Quadratic Mean Field Games and split it into two lectures, adding Linear Quadratic Mean Field Games: Extensions.

[lq_mean_field_games] Revise for the October 2026 draft and split into two lectures #1096

Added Simplified Chinese translations of five lectures, including Which Moments to Match, Social Security Trust Fund Depletion and Investment Under Uncertainty, and revised twenty existing translated lectures.

• Sir_model: restore the 2025 reviewers' wording lost in #302 #305
• [var_dmd, svd_intro, measurement_models] Correct math, add exercises #304
• [var_dmd, svd_intro, measurement_models] Correct math, add exercises #303
• [sir_model] update code and text #302
• Recover six small gaps: five state-file advances and harrison_kreps' la.solve port #301
• Deliver gallant_tauchen and social_security_depletion (the lectures of closed #294 and #296) #300
• [lucas_prescott_investment, optimal_growth_uncertainty] Two sequels to rational_expectations #286
• [two_auctions] Add exercises and further reading #284
• [house_auction] Add VCG comparison section and exercises #283
• Make main build again: install JAX in the environment, finish ak_aiyagari's household rename, add the programming intersphinx key #297
• Register the CJK font in util_rand_resp — five figures render Chinese as tofu #274
• [ak2, ak_aiyagari, two_computation] Correct math and economics, add exercises #290
• [hoist_failure] Revise fault-tree lecture and add exercises #285
• Fix Samuelson quadratic formula #282
• [tom] edits to a few lectures [ge_arrow, affine_risk_prices, and recovery_trio] #281
• [linear_algebra] Some updates on code and style and typos #280
• [qr_decomp] Some updates to code and wording #277
• [lq_robust_bewley] verify observational equivalence #269

Updated Covariance Stationary Processes, Markov Jump Linear Quadratic Dynamic Programming, and Policy Regimes and the Lucas Critique for quantecon 0.13.1.

Update lectures for quantecon 0.13.1 #393

Python Programming for Economics and Finance

• French: Updated the French translations of the Polars, Pandas for Panel Data and Adventures with Autodiff lectures, among others.
• Persian: Updated the Persian translations of the Polars, Pandas for Panel Data, and Adventures with Autodiff lectures.

• Python_oop: restore the French non-breaking spaces #92
• Update about_py.md #84
• [pandas_panel] Describe the single .replace() call, not a loop #96
• [autodiff] Open with a sentence that suits both series #95
• [polars] Fetch the FRED CSV with requests before parsing it #97
• [polars] Fetch the FRED CSV with requests before parsing it #171
• [pandas_panel] Describe the single .replace() call, not a loop #170
• [autodiff] Open with a sentence that suits both series #169

Added a new lecture, Social Security Trust Fund Depletion.

Add a lecture on Social Security trust fund depletion #1091

Added two new lectures, Policy Counterfactuals from Impulse Responses and Policy Regimes and the Lucas Critique, and modified three existing lectures on induced priors, Markov jump LQ, and supply and demand.

Add policy_counterfactuals lecture: McKay-Wolf counterfactuals and invertibility #392

Added a new lecture, Induced Priors for Impulse Responses, covering induced priors, VARs, and sign restrictions.

Add induced_priors lecture: induced priors, VARs, and sign restrictions #390

Fixed a font-weight fallback warning in eighteen Simplified Chinese translated lectures, updated the Polars lecture's data-fetching method, and revised the Pandas for Panel Data and Adventures with Autodiff lectures.

• Silence matplotlib 3.11's font-weight fallback warning in the i18n font cells #111
• [polars] Fetch the FRED CSV with requests before parsing it #108
• [pandas_panel] Describe the single .replace() call, not a loop #107
• [autodiff] Open with a sentence that suits both series #106

Added a new lecture, Which Moments to Match?, on Gallant and Tauchen's efficient method of moments, and updated Pandas for Panel Data.

• [gallant_tauchen] Add a lecture on Gallant and Tauchen's efficient method of moments #1087
• [pandas_panel] Take programming's text, so both series publish one lecture #1088

Revised the Pandas for Panel Data and Adventures with Autodiff lectures.

• [pandas_panel] Describe the single .replace() call, not a loop #645
• [autodiff] Open with a sentence that suits both series #644

Updated the Adventures with Autodiff lecture to share text with the parallel lecture series.

[autodiff] Take programming's text, so both series publish one lecture #357

Updated the Simplified Chinese translations of Wealth Distribution Dynamics, Pandas for Panel Data, Non-Conjugate Priors, Competitive Equilibria with Arrow Securities, and Misspecified Recovery.

• [wealth_dynamics] Retarget the JAX cross-reference after the lecture-jax rename #291
• [pandas_panel] Take programming's text, so both series publish one lecture #293
• Resync ge_arrow and misspecified_recovery to current source (recovers the 2026-09-20 and 2026-10-09 sync failures) #292
• Bayes_nonconj: declare the truncated log-normal prior's (0, 1] support (numpyro 0.22) #288

ContinuousDPs.jl v0.4.0 and GameTracer.jl v0.3.0

BasisMatrices.jl v0.8.3 and QuantEcon.jl v0.20.0

Added a new lecture, Estimating Wealth Tax Revenue, rewrote Maximum Likelihood Estimation as an elementary introduction, and reorganized the table of contents.

• Rename mle to mle_intro so lecture names are unique across the published sites #857
• Rename lln_clt to lln_clt_intro so lecture names are unique across the published sites #856
• Rename lake_model to lake_model_intro so lecture names are unique across the published sites #855
• Add wealth_tax lecture: estimating wealth tax revenue #852
• Rewrite MLE as an elementary lecture on maximum likelihood #849
• Reorganize table of contents #848

Corrected math and economics and added exercises to Transitions in an Overlapping Generations Model, A Long-Lived, Heterogeneous Agents, Overlapping Generations Model, and Two Computations to Fund Social Security, and updated two further lectures.

• [ge_arrow] Add the rational expectations reading of Arrow's sequential equilibrium #1084
• [wealth_dynamics] Retarget the JAX cross-reference after the lecture-jax rename #1082
• [ak2, ak_aiyagari, two_computation] Correct math and economics, add exercises #1078
• Bayes_nonconj: declare the truncated log-normal prior's (0, 1] support (numpyro 0.22) #1065

Renamed twelve lectures, including Default Risk and Income Fluctuations, Endogenous Grid Method, and Inventory Dynamics, to make lecture names unique across published sites.

Rename twelve lectures so lecture names are unique across the published sites #353

Updated the Simplified Chinese translations of several lectures, including A Lake Model of Employment, LLN and CLT, and Maximum Likelihood Estimation, with internal file renames to ensure unique lecture names across sites.

• Rename mle to mle_intro so lecture names are unique across the published sites #313
• Rename lln_clt to lln_clt_intro so lecture names are unique across the published sites #312
• Rename lake_model to lake_model_intro so lecture names are unique across the published sites #311

Added the Simplified Chinese translation of the Estimating Wealth Tax Revenue lecture and reorganized the table of contents, with related updates to the Heavy-Tailed Distributions lecture.

• Add wealth_tax lecture: estimating wealth tax revenue #309
• Reorganize table of contents #307

Updated the French translations of Names and Namespaces, Functions, and NumPy, and applied consistency fixes across six further lectures.

• Round-2 consistency pass: espace de nommage and renvoyer edition-wide, plus two hand-ports #81
• Review of the French translation of Names and Namespaces #80
• Update oop_intro.md #78
• Update functions.md #77
• Port the numpy.md edits the resync regeneration dropped (seed docstring, qe.Timer) #38

Added three new lectures (Linear Quadratic Mean Field Games, Investment Under Uncertainty, and Optimal Growth Under Uncertainty and Tobin's q), and added exercises to the two auction lectures.

• Two sequels to rational_expectations #1070
• Add exercises and further reading #1069
• Add VCG comparison section and exercises #1068

Added the Simplified Chinese translation of the Measuring Mobility lecture.

Add the Measuring Mobility lecture #299

Added two new lectures, Measuring Mobility and Bivariate Distributions.

• Add Measuring Mobility lecture #839
• Add Bivariate Distributions lecture #837

Added a new lecture, Fitting Distributions to Data.

New lecture: Fitting Distributions to Data #814

Added a language switcher linking to the Persian, French and Simplified Chinese editions.

Add language switcher support for fa, fr and zh-cn editions #490

Python Programming for Economics and Finance

Enabled the language switcher between the English, Persian, French and Simplified Chinese editions.

• French
• Persian
• Simplified Chinese

• Enable the language switcher for the French edition #21
• Enable the language switcher and fix this edition's site URLs #145
• Enable the language switcher and fix URLs copied from the English config #80

BasisMatrices.jl v0.8.2, ContinuousDPs.jl v0.3.2, GameTheory.jl v0.7.1 and QuantEcon.jl v0.19.0

Added missing quantecon and jax installs to nine lectures.

Add pip install cells for quantecon and jax in lectures that were missing them #1006

Added a new section of ten lectures on Phillips Curve Tradeoffs, and added figure captions and standardized CDF notation in the Incorrect Models lecture.

• Adding Tom's new section on Phillips Curve Tradeoffs #992
• Add figure captions and use CDF #982

BasisMatrices.jl v0.8.1, ContinuousDPs.jl v0.2.1, GameTheory.jl v0.7.0, GameTracer.jl v0.1.2 and QuantEcon.py v0.11.4

Added a new lecture, Dynamic Supply and Demand Curves.

Adding Tom's lecture on dynamic supply and demand curves #352

Added missing pip install cells to four lectures.

Add missing pip dependencies #951

Replaced the LQ Consumption Smoothing lecture with a trilogy of lectures on the LQ permanent income model, and added two lectures on unemployment dynamics, A Linear Model of Unemployment and Unemployment Dynamics with Asymmetric Shocks.

• Add Tom's LQ permanent income trilogy of lectures #943
• Add unemployment dynamics lectures (linear + nonlinear) #928

Added three new lectures, including The Kalman Filter and Vector Autoregressions and Robust Permanent Income and Pricing.

Adding Tom's new lectures on Kalman Filter and Robust Income #931

Rewrote the Non-Conjugate Priors lecture, adding notes on NUTS and variational inference, and revised the exposition and notation of Another Look at the Kalman Filter.

• Add explanatory notes to bayes_nonconj: NUTS and variational inference #918
• Rewrite the Non-Conjugate Priors lecture #913
• Update exposition of first three sections #903

GameTheory.jl v0.6.0 and GameTracer.jl v0.1.1

Added three lectures on contract theory under moral hazard and a lecture, Survey Data and Subjective Beliefs in Business Cycle Models.

Add three lectures on contract theory and one lecture on survey data and robustness #343