How should firms match long-term financing to their investments?

"A basic principle of finance is to match the term of the financing to the period over which benefits are expected to be received from the associated outlay. Short-term items should be financed with short-term funds, and long-term items should be financed with long-term funds. Long-term financing sources include both debt (borrowing) and equity (ownership). Equity financing comes either from selling new ownership interests or from retaining earnings. Financial managers try to select the mix of long-term debt and equity that results in the best balance between cost and risk."