People who join a political party are obligated to
vote
give money
volunteer during campaigns.
attend party meetings.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.