Americans are walking off the job at a rate not seen in years. The U.S. has lost seven million workdays to walkouts so far this year. WSJ’s David Harrison on the factors that are making this year one of the best in recent memory to strike.  Further Listening: -‘We’ll Strike All Three’: The UAW’s Historic Walkout  -Meet the Man Who Has Detroit on Edge  -The Case of the Hollywood Shutdown  Further Reading: -UAW Joins Wave of Union Strikes Looking for Big Wins  Learn more about your ad choices. Visit megaphone.fm/adchoices