Question

who is said this is the science of economics wealth?​

Answer 1

$here \: is \: your \: answer \: dear$
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Adam Smith

Pioneers of the science of economics defined it as a science of wealth. Adam Smith, who is known as father of economics, named his famous book on economics as “An Enquiry into the Nature and Causes of the Wealth of Nations.”

Answer 2

$\bf\underline{Adam \: Smith}$ said this is the science of economics wealth.