You inspired me to take another look at the quiz, Frank, and got a better idea of what bothers me: The quiz (and apparently the real citizenship test) are a mixture of law and concrete civic duty, with a rather large number of questions that are either trivia irrelevant to doing one's civic duty (FDR, Susan B Anthony, name of the national anthem, state capitals, border states, 13 stripes on the flag, on and on); or things like the economics question (and others) that sound a lot like propaganda.

By "propaganda" I mean that this is coming from the government, and directed at people who are presumably starting out ignorant. Mixed in with questions about real laws and Constitutional provisions, things like the economic question could be confused for legal requirements. But they're merely custom and the preference of the establishment. The Constitution is just as silent on capitalism as it is on English as our official language. Another question about the "the two major political parties", again, makes it sound as if the Constitution mandates it. But in fact the Founders hated and feared the rise of political parties; see Washington's Farewell Address for a prescient warning.

I found a study guide at La Migra's web site.

11. What is the economic system in the United States?*
▪ capitalist economy
▪ market economy

"market economy" isn't completely wrong, since Constitutional provisions protecting commerce between the states imply a market-based economy. But the web site quiz left that one out, and made the choices even more starkly black-and-white.

You're right that the questions aren't wrong because they reflect a current reality, Frank. But as I tried to explain, it's the context and implication of the questions that bothered me a bit. Not a big bit, to be sure, this is just another tempest in a teapot. But it just set of a few mental alarms.