YOU CAN’T KEEP A GOOD FRACKER DOWN: Two Years Into Oil Slump, U.S. Shale Firms Are Ready to Pump More.

Few predicted that in the fall of 2014, when Saudi Arabia signaled that it wouldn’t curb its output to put a floor under crude prices. Oil pundits concluded that a brutal culling would force higher-cost players known as marginal producers—a group that includes shale drillers—out of the market.

But the greatest consequence of the Saudi decision and subsequent price drop is that it has delayed costly oil megaprojects, from deep-water platforms off Angola to oil-sands mines in Canada.

“The U.S. isn’t the marginal barrel but the most flexible,” said R.T. Dukes, an analyst at Wood Mackenzie. “We’ll be the fastest to snap back.”

Free markets tend to do that.