Advertising is a valuable economic factor because it is the cheapest way of selling goods, particularly if the goods are worthless.
The cheapest natural gas in the world is in the United States.
Skype is easy enough to use so that people don't need to be tech savvy - a lot of users just want to communicate with their friends and family, and they find this is the easiest, cheapest way. If you can use a Web browser, you can use Skype.
It's as certain that as long as fossil fuels are the cheapest energy, we will just keep burning them.
Compromise is the best and cheapest lawyer.
The cheapest gadget - and you don't even have to spend a dime - is chopsticks from a Chinese restaurant. I use them for everything: to toss salads, to turn a piece of meat in the pan, to flip croquettes in the Fryolator, to whisk eggs for omelets, to stir eggs into fried rice when I make that for my daughters.
When you go to the grocery store, you find that the cheapest calories are the ones that are going to make you the fattest - the added sugars and fats in processed foods.
Besides my love for horses and cars, I am passionate about making the cheapest vaccines in the world. I started making life-saving drugs when I was 22.
Anyone can negatively criticize - it is the cheapest of all comment because it requires not a modicum of the effort that suggestion requires.
Good nature is the cheapest commodity in the world, and love is the only thing that will pay ten percent, to borrower and lender both.