f (p) function denotes the number of suits sold for a price p in dollars.
At Price = $200, the number of suits sold is:
f (p) = 650 - 2(200) =250 suits
Lets see how much at price = p' = 250 does it sell,
f (p)' = 650 - 2(250) = 150
Rate of change formula:
f (p)' - f(p) / p' - p = 250 - 200 / 150 - 250 = -0.5
We see that as the price increases, the number of suits sold decreases. It can also be credited by the fact that the rate of change is in negative which implies an inverse relationship between price and quantity.
Deflation means that your money has more buying power, thus it decreases the burden of paying off your loan because (in theory) you would have more money available to pay your loan since other prices have gone down.
his own agent. A buyer can perform the duties of a buyer agent himself/herself. But what he/she cannot do is try to charge a fee as a buying agent. If the buyer is actually purchasing the real estate property, he/she is not allowed to collect any fees resulting from the transaction. The buyer will actually save money because he/she is not paying her agent.