Net worth of current (NPV or NPW) in economics, engineering, etc. is one of the standard methods evaluation designs economic. In this method, the flow of liquidity(income and costs) based on the occurrence of(income or expense) to the rate of discount. This way, in the flow of liquidity, etc. worth the time to do cost or to miss the coming of the income, also in terms of. The value of the net current in the calculations, economic, economy, engineering, budget, countries, and topics of microeconomics and macroeconomic., the trade and industry, widely goes to work.