The quick recovery from what could be serious scares shows that traders are an optimistic bunch–and it’s hopefully a good sign for the rally that is now into its third year.

China’s growing clout in the artificial intelligence space has sparked a wave of optimism toward the nation’s tech shares, with a gauge entering a bull market and brokers issuing upbeat calls.

Wall Street shifted lower in early trading Wednesday as markets took in more corporate earnings reports while considering the impact of tariffs being imposed by the United States and China.