PDT 2/2 : Why has tipping increased?

[AdamBragar]

The people who really get the shaft are bartenders who have not really seen a tip increase over the years, as many people still consider the normal tip for a drink to be 1 dollar. Prices rise for drinks, but people don't usually calculate percentages when paying by cash. Tips for drinks aren't going to gradually increase, as people aren't going to start giving a $1.25 drink for a tip, and the next logical jump will be an accepted $2 per drink tip for cash purchases.