Figure 4.
Falsification test: Chinese cabbage price of 2018 and 2019. Notes: The solid line shows the fit of fourth‐order polynomial T‐RD estimation and the shaded areas are the 95 percent confidence intervals.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.