Why do Marx and Schumpeter think that cost competition (rather than just price competition) is at the heart of capitalist development?

What is "economic rent"? How does it differ from our everyday use of the term, "rent"? What is the source of economic rent? What is the difference between economic rent and (normal or equilibrium) profit? The crucial role of input substitution and price competition between firms across and within industries. Can you explain the difference between the equilibrium or normal rate of profit and economic rent? Can you explain why economists regard the price competitive or normal rate of profit as part of the cost that society must pay for the enjoyment of a particular good or service? Can you explain why economists, therefore, see 'economic rent' as income well and above the cost of production and reproduction? Define and illustrate these different kinds of economic rent.

Given that economic rent is unearned income (that is, this rent is necessarily a TRANSFER of wealth produced elsewhere in the economy). Some economists in these terms speak of the trading of products and services attracting monopoly or technical rents as an "unequal exchange." The exchange is considered "unequal" because the seller can force or persuade the purchaser to buy the product well above its replacement cost including the normal rate of profit, that is to say, well above its natural value. Try and locate the likely SOURCE of income transfer in each case. In each case, who is ultimately paying the economic rent? Who are the winners and who are the losers?