The cash balance a business holds is essentially a demand for transactions money. As stated, the size of the cash balance the firm decides to hold is directly related to its unwillingness to pay the costs necessary to use a factor to finance its short term cash needs. The problem faced by the business in deciding the size of the cash balance it wants to maintain on hand is similar to the decision it faces when it decides how much physical inventory it should maintain. In this situation, the business must balance the cost of obtaining cash proceeds from a factor against the opportunity cost of the losing the Rate of Return it earns on investment within its business. The solution to the problem is: