Consider the downward-sloping aggregate demand (AD) curve to the right. Which of the following results in a movement from point A to point B (a movement up along the AD curve) or from point A to point C (a movement down along the AD curve)?
A. Multiplier effect
B. Inflation effect
C. Wealth effect
D. Interest rate effect

D. Interest rate effect

Explanation:

Interest Rate Effect can be defined as the rate that occur due to the change in borrowing and spending attitude of a person after the interest rate might have been adjusted because in a situation where the interest rates rises it will enable both businesses and consumers to cut back on their spending the result of which will cause earnings to fall and stock prices to drop due to the fact that as the interest rates move up, the cost of borrowing becomes more expensive which is why interest rates that are high tend to always reduce inflationary pressures and cause an appreciation in the exchange rate

answer; is usually (less than) the socially optimal level of consumption;

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'