ARPU is Average Revenue Per User.
CONCENTRATION RISK is the risk that an investor will suffer from lack of diversification, investing too heavily in one industry, one geographic area or one type of security.
INCOME THEORIES try to identify the real profit of an organization. The difficulty here is that you need to define whose income you are measuring, and that limiting income measurements to things that can be given a price devalues goods and services that are difficult or impossible to price.
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