In lower-paying jobs, the monitoring is already ubiquitous: not just at Amazon, where the second-by-second measurements became notorious, but also for Kroger cashiers, UPS drivers and millions of others. Eight of the...

Mr. Sweeney made a counteroffer to Mr. Musk, according to the screenshots of the exchange, saying that he would abandon the account if Mr. Musk upped the ante to $50,000. He said...