Interest is the premium on a loan, that is added to the principal when the loan is due.
Capital goods are those goods that businesses use to create products and services for consumers.
A profit is made by creating something of economic value that is more than the cost of producing it.
“Trickle Down” Economics is a straw man argument used to attack those who advocate tax cuts.
Say’s Law of Markets is the principle that supply constitutes demand. In Jean-Baptiste Say’s words: “products are paid for with products.”