If a country's nominal interest rate is zero, then Group of answer choices the country's economy is in a liquidity trap. monetary policy is likely to be very effective in stimulating the economy. exchange rates with other countries are likely to increase. exchange rates with other countries are likely to decline. the country's economy has achieved monetary equilibrium.

the country's economy is in a liquidity trap.

Explanation:

A liquidity trap exists when interest rate are  close to or equal to zero.

When there is a liquidity trap, expansionary monetary supply would not work because people would prefer to hold cash due to the believe that a negative economic event is about to occur e.g. deflation

When there is a liquidity trap, individuals prefer to save their monies rather than buy bonds

Liquidity trap was first discovered by John M. Keynes

Solutions to liquidity trap

1. Policies that would make savings less attractive

2, Increased government spending

Liquidity trap occurred in Japan in the 1990s and this led to a deflation

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.'