The Wall Street Journal China’s Stock-Sale Ban Eases Path to Propping Up Reeling Markets — China’s reported ban on the net sales of equities during market opens and closes theoretically makes it easier to prop up reeling stocks, in part by hamstringing quantitative traders at critical parts of the trading day. Nvidia Sales Reach New Heights as Company Forecasts Bigger AI Boom — The chip maker at the heart of the artificial-intelligence craze has had a record run, nearing $2 trilli