Crop export prices dropped like a rock last month, falling by more than 5 percent. That’s the fastest dive we’ve seen in seven years, according to a report issued  recently by the Department of Labor.

Government figures are important for understanding trends, but they cover up a lot of individual stories.

So let me tell you what these export-price statistics have meant for my farm in Iowa, where I grow corn and soybeans and raise hogs. Or, to look at it another way, let me tell you about my farm’s financial snapshot.

 We’re facing tariff turmoil in a time of abundance. The price of corn has dropped 30...