Which of the following statements is true of the second tier of the global economy pyramid?
a. it consists of a billion people making $2,000 to $20,000 a year.
b. it mostly consists of people who live in the developed economies.
c. it mostly consists of people who live in north america, western europe, and japan.
d. it consists of the vast majority of the people who make less than $2,000 a year.

a. It consists of a billion people making $2,000 to $20,000 a year.

Explanation:

The global economy pyramid is divided into three levels, which are called three tiers.

Under tier 1 only people having income more than $20,000 are present, and generally they live in developed economies, like: Western Europe, Japan, etc:

Under tier 2 people having income more than $2,000 and less than $20,000 are found, these are around 1 billion in population.

Under tier 3 maximum population lives, which is approximately 4 billion people.

Therefore, the correct statement is :

a. It consists of a billion people making $2,000 to $20,000 a year.