Capital Structure and Its Determinants | 公司资本结构及其影响因素

📚 Capital Structure and Its Determinants | 公司资本结构及其影响因素

Capital structure refers to the way a company finances its overall operations and growth by using different sources of funds: debt, equity, or hybrid securities. It is one of the most critical decisions in corporate finance because it directly affects the firm’s risk, cost of capital, and value.

资本结构是指公司通过不同资金来源（债务、股权或混合证券）为其整体运营和发展融资的方式。它是公司金融中最关键的决策之一，因为它直接影响企业的风险、资本成本和企业价值。

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1. What Is Capital Structure? | 什么是资本结构

In simple terms, capital structure is the mix of long-term sources of finance used by a company. A firm can raise funds by issuing shares (equity financing) or by borrowing money (debt financing). The proportion of debt to equity is the essence of capital structure.

简单来说，资本结构是公司所使用的长期融资来源的组合。企业可以通过发行股票（股权融资）或借入资金（债务融资）筹集资金。债务与股权的比例就是资本结构的核心。

A company with more debt is said to be highly geared (leveraged), while one with more equity is lowly geared. The target capital structure is the mix that minimises the cost of capital and maximises shareholder wealth.

债务较多的公司被称为高杠杆公司，而股权较多的公司为低杠杆公司。目标资本结构是使资本成本最小化并使股东财富最大化的组合。

资本结构通常以资产负债表的右侧表示，包含长期负债、优先股和普通股等项目。

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2. Measuring Capital Structure | 资本结构的衡量指标

Financial analysts use several ratios to measure and compare a firm’s capital structure. The most common ones include the debt-to-equity ratio, the debt ratio, and the equity ratio.

财务分析师使用多种比率来衡量和比较企业的资本结构。最常用的包括债务权益比率、债务比率和权益比率。

• Debt-to-Equity Ratio = Total Debt / Total Equity
• 债务权益比率 = 总债务 / 总权益
• Debt Ratio = Total Debt / Total Assets
• 债务比率 = 总债务 / 总资产
• Equity Ratio = Total Equity / Total Assets
• 权益比率 = 总权益 / 总资产

These ratios indicate the financial risk of a company. A high debt-to-equity ratio signals high financial leverage, which may boost returns but also increases the probability of bankruptcy.

这些比率反映了公司的财务风险。高债务权益比率意味着高财务杠杆，这可能会提高回报，但也会增加破产的可能性。

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3. Equity vs. Debt: Key Differences | 股权融资与债务融资的主要区别

Equity and debt are the two fundamental building blocks of capital structure. They differ in terms of ownership, cost, risk, and treatment of taxes.

股权和债务是资本结构的两个基本组成部分。它们在所有权、成本、风险和税务处理方面存在差异。

Feature | 特征	Debt | 债务	Equity | 股权
Ownership | 所有权	Creditors have no ownership | 债权人无所有权	Shareholders own the company | 股东拥有公司
Return | 回报	Fixed interest payment | 固定利息	Dividends, variable | 股息，不固定
Tax treatment | 税务处理	Interest is tax-deductible | 利息税前扣除	Dividends paid from after-tax profits | 股息从税后利润中支付
Risk | 风险	Lower risk for investors, but mandatory payments | 投资者风险较低，但还款是强制的	Higher risk, residual claim | 风险较高，剩余求偿权

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4. Cost of Capital and WACC | 资本成本与加权平均资本成本

The cost of capital is the minimum return a company must earn on its investments to satisfy its investors. The weighted average cost of capital (WACC) reflects the blended cost of all sources of finance.

资本成本是公司为满足其投资者而必须从投资中获得的最低回报率。加权平均资本成本（WACC）反映了所有融资来源的混合成本。

WACC = (E/V) × Re + (D/V) × Rd × (1 – Tc)

Where E is the market value of equity, D is the market value of debt, V = E + D, Re is the cost of equity, Rd is the cost of debt, and Tc is the corporate tax rate.

其中E是权益的市场价值，D是债务的市场价值，V = E + D，Re是股权成本，Rd是债务成本，Tc是公司税率。

As debt is cheaper than equity due to tax shields and lower risk, adding debt can reduce WACC initially. However, beyond a certain point, financial distress costs push WACC upward.

由于税收抵免和较低的风险，债务成本低于股权成本，因此适当地增加债务可以降低WACC。然而，超过某一点后，财务困境成本会使WACC上升。

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5. Modigliani-Miller Theorem | 莫迪利亚尼-米勒定理

The Modigliani-Miller (MM) theorem is a cornerstone of capital structure theory. In a world without taxes, transaction costs, or bankruptcy costs, MM argued that capital structure does not affect a firm’s value.

莫迪利亚尼-米勒（MM）定理是资本结构理论的基石。在没有税收、交易成本或破产成本的世界中，MM认为资本结构不影响企业价值。

This is because investors can replicate any capital structure by borrowing or lending on their own accounts. Thus, the total value of the firm depends only on its operating cash flows, not on the debt-equity split.

这是因为投资者可以通过自己的借贷行为复制任何资本结构。因此，企业的总价值仅取决于其经营现金流，而不是债务与权益的划分。

Once taxes are introduced, MM’s second proposition states that the value of a levered firm equals the value of an unlevered firm plus the present value of the interest tax shield.

一旦引入税收，MM第二定理指出，有负债企业的价值等于无负债企业的价值加上利息税盾的现值。

VL = VU + Tc × D

This suggests that firms should borrow as much as possible to maximise value, which is unrealistic in practice due to bankruptcy risks.

这表明企业应尽可能多地借款以使价值最大化，但这在实践中因破产风险而并不现实。

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6. Trade-off Theory | 权衡理论

The trade-off theory extends MM by recognising real-world frictions. It argues that firms balance the tax benefits of debt against the costs of financial distress and potential bankruptcy.

权衡理论通过承认现实世界的摩擦对MM理论进行了扩展。该理论认为企业会在债务的税收利益与财务困境及潜在破产成本之间进行权衡。

As debt levels increase, the marginal benefit of each additional unit of debt falls, while the marginal cost rises. The optimal capital structure occurs where these two margins are equal.

随着债务水平上升，每增加一单位债务的边际收益下降，而边际成本上升。最优资本结构出现在这两个边际量相等之处。

Financial distress costs include direct costs like legal and administrative expenses, and indirect costs like loss of customers, suppliers, and employee morale.

财务困境成本包括直接成本（如法律和行政费用）和间接成本（如客户流失、供应商流失和员工士气下降）。

因此，企业不会无限制地使用债务，而会选择一个目标杠杆比率，这通常因行业和企业特性而异。

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7. Pecking Order Theory | 优序融资理论

The pecking order theory, proposed by Myers and Majluf, suggests that firms prefer internal financing first, then debt, and finally equity as a last resort.

优序融资理论由迈尔斯和马吉卢夫提出，认为企业优先选择内部融资，其次是债务，最后才考虑股权融资。

This preference arises from information asymmetry: managers know more about the firm’s prospects than outside investors. Issuing equity is often seen as a signal that shares are overvalued, which can depress the stock price.

这种偏好源于信息不对称：管理者比外部投资者更了解公司的前景。发行股票通常被视为股价被高估的信号，可能会压低股价。

Therefore, profitable firms tend to accumulate retained earnings and borrow only when necessary, while issuing equity only when their debt capacity is exhausted.

因此，盈利能力强的公司倾向于积累留存收益，只在必要时负债，并且只在债务能力耗尽时才发行股票。

这一理论解释了为什么现实中许多盈利企业杠杆率反而较低，这与权衡理论的预测并不完全一致。

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8. Internal Determinants of Capital Structure | 资本结构的内部影响因素

Several firm-specific factors influence the choice of capital structure. Profitability is one of the most significant: firms with high returns on assets tend to use less debt because they can finance growth from internal funds.

影响资本结构选择的公司特定因素有很多。盈利能力是最重要的因素之一：资产回报率高的公司使用的债务较少，因为它们可以利用内部资金为增长提供资金。

• Asset tangibility: firms with more tangible assets can pledge them as collateral, allowing more debt.
• 资产有形性：拥有更多有形资产的公司可以将其作为抵押品，从而允许更多债务。
• Growth opportunities: firms with strong growth prospects face higher costs of financial distress, so they tend to use more equity.
• 成长机会：具有强劲增长前景的公司面临更高的财务困境成本，因此倾向于使用更多股权。
• Firm size: larger firms are more diversified and have better access to credit markets, enabling higher leverage.
• 公司规模：大公司更加多元化，且更容易进入信贷市场，因此杠杆率可以更高。
• Managerial attitude: conservative managers prefer lower leverage to reduce financial risk.
• 管理层态度：保守的管理者倾向于降低杠杆以减少财务风险。

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9. External Determinants of Capital Structure | 资本结构的外部影响因素

External factors also play a vital role in shaping financing decisions. Interest rates, tax policy, and market conditions can all push a company toward debt or equity.

外部因素在塑造融资决策中也起着重要作用。利率、税收政策和市场条件都可能推动公司选择债务或股权融资。

• Interest rate levels: low interest rates reduce the cost of debt and encourage borrowing.
• 利率水平：低利率降低了债务成本，鼓励企业借款。
• Tax rate: higher corporate tax rates increase the benefit of the debt tax shield, making debt more attractive.
• 税率：较高的公司税率提高了债务税盾的收益，使债务更具吸引力。
• Stock market conditions: a bull market may ease equity issuance, while a bear market makes debt more favourable.
• 股票市场状况：牛市可能使股票发行更容易，而熊市则使债务融资更为有利。
• Industry norms: firms often imitate the capital structures of their competitors to avoid losing market credibility.
• 行业惯例：公司往往会模仿竞争对手的资本结构，以免失去市场信誉。

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10. Financial Leverage and Risk | 财务杠杆与风险

Financial leverage refers to the use of debt to amplify returns to shareholders. A rise in operating profits will cause a more than proportional increase in earnings per share when a firm is leveraged.

财务杠杆是指利用债务来放大股东回报。当公司使用杠杆时，营业利润的上升将导致每股收益更大比例的上升。

The degree of financial leverage (DFL) measures this sensitivity.

财务杠杆系数（DFL）衡量这种敏感性。

DFL = Percentage Change in EPS / Percentage Change in EBIT

High leverage magnifies profits in good times but also amplifies losses during downturns. This trade-off between higher returns and higher risk is fundamental to capital structure decisions.

高杠杆在景气时期会放大利润，但在经济下行时期也会放大损失。高回报与高风险之间的权衡是资本结构决策的基础。

此外，财务杠杆过高可能导致债务评级下调，增加再融资成本，甚至引发流动性危机。

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11. EBIT-EPS Analysis | EBIT-EPS分析

The EBIT-EPS analysis is a practical tool used to compare different financing plans. It examines how alternative capital structures affect earnings per share at various levels of operating profit (EBIT).

EBIT-EPS分析是比较不同融资方案的实际工具。它考察在不同营业利润（EBIT）水平下，各种资本结构如何影响每股收益。

To find the indifference point, set the EPS formulas of two plans equal to each other and solve for EBIT.

为找到无差异点，将两个方案的EPS公式相等，并求解EBIT。

EPS = ((EBIT – Interest) × (1 – Tax rate) – Preference dividends) / Number of shares

If expected EBIT exceeds the indifference point, the higher-leverage plan yields higher EPS; otherwise, the equity-financed plan is superior.

如果预期EBIT高于无差异点，高杠杆方案将产生更高的每股收益；否则，股权融资方案更优。

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12. Conclusion: Choosing the Optimal Capital Structure | 结论：选择最优资本结构

There is no single formula for the optimal capital structure. It depends on the unique circumstances of each firm, including industry, asset base, growth stage, and market conditions.

最优资本结构没有唯一的公式。它取决于每家企业的具体情况，包括行业、资产基础、发展阶段和市场条件。

In practice, firms combine theory with managerial judgement. They consider risk tolerance, investor expectations, and strategic flexibility when setting their target capital structure.

在实践中，企业将理论与管理判断相结合。在设定目标资本结构时，它们会考虑风险承受能力、投资者预期和战略灵活性。

Ultimately, a well-chosen capital structure lowers financing costs, enhances shareholder value, and provides the financial stability needed to weather economic cycles.

最终，合理的资本结构能够降低融资成本，提升股东价值，并提供抵御经济周期所需的财务稳定性。

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