What are the best university in USA for having PHD in economics?

Hello I need to know the best university to study economics and PHD preparation in economics?what are required paper? what are average fees? whats the expected time needed to finish PHD ?what are the advantage of studying economics at USA?

Best is very relative, it all depends on what you want…We do not advise on schools here. You can check few university websites to understand the fee and requirements.