Acommon economic principle is that when incomes rise consumption also rises ceteris paribus. including ceteris paribus in this statement allows economists to:

It allows economists to divide the impact of a change in income from other variables that affect consumption.

Explanation:

Ceteris paribus means "all things being equal". However, Ceteris paribus, the change in income will result in the consumer having more purchasing power and changes in the number of goods the consumer will demand. And this is relative to the consumer's choice, the purchasing power of the consumer increases due to the rise in the consumers' income through wages, grants received from the government, etc.  

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the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.