Thirsty? That's Extra.

• Author: Hays, Constance L.
• Position: Coca-Cola Co. reportedly testing a vending machine that will raise prices when the weather is warm

Buying a Coke on a hot day next summer might leave vending-machine customers feeling hot under the collar. Not to mention lighter in the wallet.

For the past year, the Coca-Cola Company has been quietly testing a machine that, with aid of a heat sensor and a computer chip, will automatically raise the price of drinks when the weather turns warm.

Coke hopes to boost profits, but so far, the idea has...