At the end of the day, however, the - 英語 - 教えて！goo

At the end of the day, however, the root cause of financial market excesses on both the upside and the downside of the cycle is collective human behavior: unbridled optimism on the upside and fear on the downside, all in a setting in which it is literally impossible to anticipate when optimism gives rise to fear or fear gives rise to optimism.

　セミコロン後の「抑えの効かない市場の高揚の楽観主義と市況後退の恐怖」に対応する述部がないように思えるのですが，述部を含めてお訳しください。
　宜しくお願い致します。