US: One car = 1/4, One ton of grain = 1/10 Japan: One car = 1/4, One ton of grain = 1/5 American and Japanese workers can each produce 4 cars a year. An American worker can produce 10 tons of grain a year, whereas a Japanese worker can produce 5 tons of grain a year. To keep things simple, assume that each country has 100 million workers.: