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why do firms go public? - Marriott School

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minimize the weighted average cost of capital (WACC). In a discounted cash flow context,<br />

minimizing the WACC, ceteris paribus, maximizes the value of the firm.<br />

The crucial development of a theoretical optimal capital structure begins the debate on<br />

whether, and <strong>why</strong>, managers issue <strong>public</strong> equity. The early capital structure literature (e.g., Kraus<br />

and Litzenberger (1973) and Kim (1978)) offers the trade-off hypothesis that financial managers<br />

will issue equity when it will minimize their WACC, thus maximizing the value of the firm.<br />

Williamson (1988) extends this literature arguing that sometimes external equity is the cheapest<br />

option for financing certain assets. The WACC argument offers the hypothesis that managers<br />

issue <strong>public</strong> equity (i.e., <strong>go</strong> <strong>public</strong>) when the influx of IPO proceeds will decrease the overall<br />

company cost of capital, thereby maximizing firm value.<br />

The difficulty in testing this hypothesis directly is that the WACC is typically an internal<br />

measure computed within <strong>firms</strong>. Most <strong>firms</strong> have their own in-house method for computing the<br />

WACC. Although, Graham and Harvey (2001) find that 73.5% of the CFOs they survey use the<br />

capital asset pricing model (CAPM) to estimate the cost of equity, we <strong>do</strong> not know what these<br />

<strong>firms</strong> use for their inputs. Over how long of a period <strong>do</strong> they estimate beta for the CAPM What<br />

<strong>do</strong> they use for their risk-free rate Where <strong>do</strong> they get their market risk premium estimate<br />

Although data availability of firm WACC inhibits direct tests of the optimal cost of capital<br />

hypothesis, researchers have been able to test if the cost of debt has declined via an IPO. Because<br />

a decrease in the cost of debt <strong>do</strong>es not necessarily indicate a decrease in firm-level WACC, the<br />

next section <strong>do</strong>es not explicitly test the WACC hypothesis. Although the survey approach to<br />

research is discussed towards the end of this paper, it is possible to test the WACC question by<br />

asking IPO participants directly. Analysis of this hypothesis (and all of the others) will be<br />

included in the survey section.<br />

5

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