1. The entrepreneur's main goal is to maximize economic profit by increasing total revenue and decreasing total costs, which include both explicit costs and implicit opportunity costs.
2. Economic profit is calculated as total revenue minus total costs, including both explicit costs and implicit opportunity costs. Return is equal to economic profit minus normal profit.
3. Firms are constrained by technology, information, and market forces. Technological constraints relate to available production methods and resources, while information constraints involve what data is available and costly to obtain. Market constraints depend on customer willingness to pay and levels of competition.