Pecking order theory
In corporate finance, the pecking order theory (or pecking order model) postulates that "firms prefer to finance their investments internally, using retained earnings, before turning to external sources of financing such as debt or equity" - i.e. there is a "pecking order" when it comes to financing decisions. The theory was first suggested by Gordon Donaldson in 1961 and was modified by Stewart C. Myers and Nicolas Majluf in 1984.