national income measures the wealthy that exists in an economy.national income statistics wl determine national output under the fomular:output=income=expenditure!however the appropriateness of national income ar a measure of output is compromised by the weaknesses inherent in obtaining national income data!national income disregards underground economy or the black market which as a result economies that constitute a significant amount of such markets would have an understated national income figure thus its true measure of national out put wl nt be realised if these statistics are used!

national income in nigeria

cotton output and cloth output.

Yea

identify output and output may be final or intermediate