Gas prices rose almost 50 cents in the past week, as today, the price of a barrel of oil went up to nearly $120, then back down to $85. The roller coaster is leading to a lot of uncertainty - though President Trump is trying to reassure Americans relief at the pump is on the way.

Wall Street's main stock indexes reversed early losses and gained in choppy trading on ​Tuesday, as investors took comfort from tumbling crude prices on expectations that the Middle East conflict coul...