The following letter to the editor in the Wall Street Journal some time ago said it well:

“Liberals will never learn that when a rich man prospers and goes out to dinner more often, strange things happen: the waiter gets an additional tip that evening; more busboys are needed; the person who produced the wine sells and additional bottle; the bottle maker makes more bottles; the dock worker who ships the wine gets more overtime, the workers on the ship are employed, the wine distributor sells more bottles of wine, the farmer who raises the cow that turned into a steak makes more money, as do the meat-processing employees, the janitor who cleans the processing plant, and so on.  Yes, Virginia, there is such a thing as trickle-down economics, and it happens every day, but more so on some days than others, depending on whether the economy is stronger and the rich man is eating out more often.

“In other words, a rising tide lifts all boats.  Speaking of boats, when the rich man orders a boat, the electrician has more work, as does the plumber; the cushion maker makes more cushions, etc.  You know the rest of the story.”