The Pecking Order Theory

When a public company announces it is issuing new shares, the stock price almost always drops — often by 2-3% on the announcement alone, before anyone knows what the money will fund. That reaction is strange if capital structure were just a tax-versus-distress optimization: raising cash to fund good projects should be good news. The pecking order theory explains the drop with a simpler idea — managers know more about the company's true value than outside investors do, and an equity issue is a signal about what managers believe, whether they intend it or not.

The logic of the ordering

Managers, who see the company's prospects from the inside, will only sell new shares when they believe the stock is fairly priced or overvalued — selling undervalued shares means handing new investors a bargain at existing shareholders' expense. Outside investors know this about managers' incentives, so the announcement of a share issue is itself evidence the stock is not undervalued, and the market marks the price down in response, regardless of what the money will actually be spent on. This single piece of logic, formalized by Myers and Majluf, produces a strict preference ordering for how companies fund anything, from a new factory to an acquisition:

1. Internal cash — retained earnings and cash on hand. No information asymmetry problem exists at all, because no outside investor needs to be convinced of anything.
2. Debt — a fixed claim whose value moves relatively little even if the company's prospects are somewhat overstated, so mispricing costs lenders (and by extension the company) little. Safe debt first, then progressively riskier debt.
3. Equity — only when debt capacity is exhausted or the risk of distress from more debt is too high, because equity is the security most sensitive to the manager's private information, and therefore the most expensive to issue when that information is bad news for outsiders.

rising information-asymmetry cost →

A worked example

A software company generates $60m of free cash flow a year and wants to fund a $150m acquisition. Under the pecking order, it first draws down its $40m cash balance, covering $40m of the $150m with zero signaling cost. It still needs $110m. Its balance sheet is lightly levered, so it issues $110m of investment-grade bonds at a modest 5.5% coupon — debt investors' claim is fixed, so even if the company's true prospects are somewhat worse than the market believes, bondholders are affected only marginally, and the announcement barely moves the stock.

Contrast that with a similarly-sized company that is already carrying heavy debt and cannot safely borrow more. To fund the same $150m acquisition it has no choice but to issue equity. The market, seeing an equity issue rather than a debt issue, infers the company had no cheaper alternative — a mildly negative signal on its own — and the stock typically falls a few percent on the announcement, independent of whether the acquisition itself is a good idea.

Why real-world leverage patterns often fit this better

Pecking order theory explains an empirical fact the trade-off theory struggles with: highly profitable companies often carry less debt than the trade-off theory's tax-shield logic would predict, because they simply generate enough internal cash to avoid external financing altogether — not because they have deliberately chosen a low target leverage ratio. Debt levels, under this view, are less a deliberate target and more a byproduct of the gap between investment needs and internal cash generation over time.