?勞動(dòng)分工受市場(chǎng)規(guī)模的限制。
人們變得文明，不在于他們?cè)敢庀嘈诺某潭?，而在于他們?cè)敢鈶岩傻某潭取?/div>
The idea that a bell rings to signal when investors should get into or out of the market is simply not credible.