Regressive taxes can exacerbate income inequality. By definition, regressive taxes take a larger percentage from those with lower incomes than from those with higher incomes. As a result, the relative tax burden on the poor is higher, reducing their disposable income proportionally more than for the wealthy. Over time, this can widen the income gap, as the wealthy retain a larger portion of their income while the less affluent struggle with higher relative expenses. In societies aiming for vertical equity, where those with a greater ability to pay should contribute more, regressive taxes can be seen as inequitable and counterproductive.

Not all indirect taxes are regressive, though they can have regressive effects. The regressivity of an indirect tax depends on how the tax affects individuals across different income levels. If an indirect tax, like a VAT, is applied uniformly across products, it might take a larger percentage of a lower-income individual's earnings than that of a higher-income individual, making it regressive. However, if an indirect tax targets luxury goods predominantly purchased by the wealthy, it might not be regressive. It's essential to analyse the consumption patterns and the specific goods or services being taxed to determine the tax's progressivity or regressivity.

Taxes can reduce both consumer and producer surplus. Consumer surplus is the difference between what consumers are willing to pay and what they actually pay. When a tax is imposed, especially an indirect tax, the price of a product might increase, reducing the consumer surplus. Producer surplus, on the other hand, is the difference between the price at which producers are willing to sell and the price they actually receive. Taxes can increase the cost of production or reduce the net price received by producers, thereby decreasing the producer surplus. The combined loss of consumer and producer surplus due to a tax is termed as the deadweight loss.

Taxes can influence long-term economic growth in various ways. On one hand, high taxation can deter investment and savings, reduce entrepreneurial activities, and discourage work effort, potentially slowing economic growth. On the other hand, the revenue generated from taxes can be reinvested into the economy in the form of public goods and services, infrastructure, education, and health, which can foster economic growth. The net effect of taxes on growth depends on the efficiency of tax collection, the effectiveness of government spending, and the specific economic context. It's a delicate balance between generating revenue for public investment and not stifling private sector activity.

Governments might prefer indirect taxes for several reasons. Firstly, indirect taxes can be less visible to consumers. While direct taxes like income tax are often noticeable deductions, indirect taxes are embedded in the price of goods, making them less apparent. Secondly, indirect taxes can be used to influence consumer behaviour. By taxing harmful products like tobacco or alcohol, governments can discourage their consumption. Additionally, indirect taxes are often easier to administer and collect. Since they're levied at the point of sale or production, there's a clear mechanism for collection, reducing evasion rates. Lastly, indirect taxes can be more stable revenue sources, especially when applied to essential goods with inelastic demand.