2023-12-07-IMF-Optimal_Taxation_of_Inflation_109页_2mb

Summary of "Optimal Taxation of Inflation"

This IMF working paper explores tax on inflation policy (TIP) as a complement to monetary policy (MP) to manage inflation, particularly from distributional conflicts or inflation expectation shocks. The paper:

1. Posits TIP as a market-based tool to correct externalities in firms' pricing decisions by imposing a tax proportional to price increases, helping moderate inflation without exacerbating relative price distortions (unlike direct price controls).

2. Argues TIP complements, rather than substitutes MP. While MP addresses demand shocks, TIP tackles markups and inflation expectations. Combining TIP and MP under optimal rules (*) can stabilize inflation and output, lowering inflation variance significantly (up to ~45%) compared to MP alone.

3. Formalizes TIP's equivalence to subsidies or other mechanisms (e.g., feebate or market permits), showing TIP is less costly for budgets and avoids administrative burdens compared to direct subsidies. It is robust across different implementation channels and model specifications, including Calvo or Rotemberg price stickiness frameworks.

4. Quantifies effects and specialization, finding TIP should target inflation and specialize in shock types distinct from those addressed by MP, leading to substantial welfare gains under commitment. Stylized facts and simulations demonstrate TIP's effectiveness even when applied only to large firms.

Overall, TIP emerges as a promising tool to broaden macroeconomic stabilization options, especially in environments with persistent inflation driven by non-demand-side factors.