Which two countries have different economic systems?
Pretty much every country has a slightly different economic system from the countries around it. Even the US and Canada are different in some ways. Perhaps the easiest difference to research would be between the US and China, since both are global superpowers and their economic systems are very different. The US is basically a free-market capitalist economy, and China is currently transitioning between “communism” (actually, a crude approximation thereof) and a US-style economy.