Since it is not easy to judge the direction of force in a fall, much less the extent of force, the belayer must evaluate each situation and make use of the rock for the most secure position.

With each new leg higher, the bond market gets more expensive and interest rates, which move in the opposite direction of price, fall even lower.

Investors that try to predict the short-term direction of Chinese stock prices could get burned if prices — as they did in February — fall then quickly snap back.