单选题

Which of the following condition is least likely to be the reason that a black market is generally inefficient?（）

A、 Unenforceable contract.
B、 Increased prices required by suppliers due to the risk of prosecution.
C、 Intensive control by the government.

【正确答案】 C

【答案解析】

A black market is generally inefficient because: Contracts are not as enforceable. The risk of prosecution increases the prices required by suppliers. Quality control deteriorates, which leads to more defective products.