Having worked in a construction site in another country my observation would be that we used to have countless undeclared labor for tax reasons anf now we have

Having worked in a construction site in another country my observation would be that we used to have countless undeclared labor for tax reasons anf now we have countless divided by two... Now working as an analyst it is important each time to have a ground knowledge and business expert to avoid obvious measurement biases. Especially when comparing different eras.