用underground economy造句子，“underground economy”造句

Study of influence of underground economy on macro economy in China;

There is tax evasion in underground economy and open economy.

Contrasted with the underground economy, recessive industry is a special industry characterized by its relativity, extensiveness, scale, and transitivity.

Speaking in Texas close to the border with Mexico, Mr Obama said bringing illegal immigrants out of the underground economy would be good for the country as a whole.