In their JPE article, Bernhofen and Brown use the change in prices in Japan from the early 1850s to 1869 to measure the difference between international trade prices and autarky prices. What is the main finding in Figure 4? In what sense is this a test of

In their JPE article, Bernhofen and Brown use the change in prices in Japan from the early 1850s to 1869 to measure the difference between international trade prices and autarky prices. What is the main finding in Figure 4? In what sense is this a test of