Resource Mobility is Costless : Factors of production such as labor, capital, or land are mobile both within and outside of the market with costless friction allowing the long term normalization of profit. No Externalities: There should be no cost or benefit external to the production or consumption of the good, meaning that all the costs and benefits are included in the price. Perf... https://finxl.in/advanced-financial-planning-and-analysis-course.html