An existing company can generate internal financing through retained earnings, profits plowed back into the business, and depreciation. Profits not distributed to shareholders are retained and reinvested in the company, a process known as self-financing. Benefits of plowing profits back include economic expansion and growth, redemption of loans, satisfying working capital needs, and making the company self-reliant. However, over-capitalization, creation of monopolies, and shareholder dissatisfaction are potential limitations. Depreciation is the gradual decrease in asset value over time, which is recorded through book entries that reduce asset book value and profits by the same amount each year.