Su Wu lived from 140 B.C. to 60 B.C. through the three dynasties of Emperor Wu (140 B.C.-87 B.C.), Emperor Xuan and Emperor Zhao. During the reign of Emperor Wu, five baht coins were used throughout the country. During the reign of Emperor Zhaodi and Emperor Xuan, prices were stable, and due to the development of agriculture, the price of grain was lower than in the early Han Dynasty, with as little as five coins per drachm, which indicates that the purchasing power of the five-baht coin was quite high.

And two million ago would have bought 400,000 ducats of grain.

In the Han Dynasty, one dendro was equal to ten buckets, and one city bucket was about 2,000 milliliters, which was about equal to 13.5 pounds of grain, which shows that one dendro of grain was about 135 pounds, so 400,000 dendro was equal to 54 million pounds now, or 27 million kilograms, 27,000 tons.

In 2010, the price of grain rose, and now there may be about 2300 yuan / ton or so.

Then 2,70,000 tons of grain would be roughly equivalent to $62.1 million now.

To summarize, 2,000,000 coins in the Han Dynasty would be equivalent to 62.1 million yuan today.