Revise Equity and redistribution of income and wealth for Cambridge 9708 (8.2)

Income refers to a flow of money received over a period, such as wages, salaries, and profits. Wealth, in contrast, is a stock of assets owned at a point in time, including property, shares, and savings. Inequality in the distribution of income and wealth is a significant economic issue. The primary tools for measuring this are the Lorenz curve and the Gini coefficient. The Lorenz curve graphically illustrates the distribution, showing the cumulative percentage of income held by the cumulative percentage of the population. A perfectly equal society would have a straight 45-degree line. The further the Lorenz curve bows away from this line, the greater the inequality. The Gini coefficient provides a numerical value for this inequality, ranging from 0 (perfect equality) to 1 (perfect inequality).

It is crucial to distinguish between equity and equality. Equality means that everyone receives the same outcome or resources (e.g., everyone earns £30,000). Equity, however, means fairness. In economics, this often involves two principles. Horizontal equity suggests that individuals in identical circumstances should be treated identically by the tax and benefits system. Vertical equity, on the other hand, argues that it is fair for those with a greater ability to pay to contribute a larger proportion of their income in tax. Most government redistribution policies are based on the principle of vertical equity, aiming to create a fairer, not necessarily an equal, society by reducing the gap between the richest and poorest.

Progressive taxation is a cornerstone of income redistribution policy. A tax system is progressive if the proportion of income paid in tax rises as income increases. This means higher earners not only pay more tax in absolute terms but also as a higher percentage of their income. For example, a country might have a 0% tax rate on the first £12,570, 20% on income up to £50,270, and higher rates thereafter. This system automatically takes a larger share from the wealthy, reducing post-tax income differentials. The revenue generated from these taxes can then be used to fund government spending, including transfer payments. The effect of a progressive tax system is to shift the post-tax Lorenz curve closer to the line of perfect equality, thereby lowering the Gini coefficient.

While taxation addresses the income of the wealthy, the government also supports the poor through direct spending. Transfer payments are payments made to individuals without any corresponding good or service being provided in return. These are not included in GDP as they are a transfer of existing income, not a creation of new income. Key examples include unemployment benefits (Jobseeker's Allowance), state pensions, and disability allowances. Additionally, governments provide benefits in kind, which are public services provided for free or at a subsidised rate. The most significant are state-funded education and healthcare. These services increase the real income of poorer households, as they do not have to pay for essential services, thereby improving their standard of living and reducing inequality.

A central debate in this topic is the potential trade-off between equity and efficiency. Policies designed to redistribute income and create a more equitable society may have unintended consequences that reduce economic efficiency. For instance, high marginal rates of progressive income tax could create a disincentive to work harder, seek promotion, or take entrepreneurial risks, as a larger portion of any extra income is taken by the tax authorities. Similarly, generous unemployment benefits might reduce the incentive for the unemployed to actively seek work. This conflict is sometimes described using the 'leaky bucket' analogy: when transferring water (income) from one place to another, some inevitably leaks out due to administrative costs and these disincentive effects. The challenge for any government is to design policies that improve equity without significantly harming efficiency and long-term economic growth.