By Friday’s close, it appeared that the turmoil that whipsawed the U.S. equities market for the last several days was over.

China’s many measures signaled that it was determined to reign in whatever was plaguing its markets and economy. Then, U.S. investors remembered, prompted by solid durable goods orders and an upwardly revised gross domestic product for the second quarter released last week, that the U.S. economy is fundamentally sound.