The recent tax cuts in the US by the Trump administration are estimated to create above 4% growth each year according to Gary Cohn – Director of the National Economic Council. If the US does achieve this level of growth, tax reform is said to have little impact as long-term growth – studies have estimated that the tax bill will have an impact of between 0.4% – 0.9% on GDP.
Textbooks that cover supply-side policies tend to suggest that lower taxes on labour income should raise its supply whilst lower taxes on capital income should increase saving and investment which should then increase labour productivity and competitiveness in the market place. But there is the income and substitution effect to consider. With tax cuts people’s income increase therefore there is the chance that the substitution and income effects come into play.
Substitution effect – if wages are higher workers may forgo some of their leisure time and work longer hours. SS1 on the graph
Income effect – if wages are higher workers may reduce some of their working hours as the demand for leisure time goes up – SS2 on the graph
Most textbooks favour the substitution effect with tax cuts although research shows that neither labour-force participation nor hours worked move in response to tax changes. However reported labour income does rise in response to income tax cuts, thanks largely to less tax avoidance. Furthermore savings rates have changed little with tax cuts in fact they have decreased in the US over the past 40 years. Savings rates are important for investment purposes although the current administration believes that this shortfall will be filled by overseas investors.
Oligopolists to benefit
With the lack of competition in US industry – especially in the banking sector – it is the these companies (many whom are oligopolists) and their shareholders who will reap the benefits of tax cuts. Research has shown that a cut in corporate tax of 10% would raise long-run output output by 0.15%. National Income would raise less with much of the addition to GDP going overseas.
What about higher interest rates?
Although tax cuts (increase in demand) do help out especially when there is a lot of spare capacity in the economy this is hardly the case at the moment. The US has limited spare capacity and the Federal Reserve fearing inflation have been more contractionary in their actions by recently increased interest rates which cancels out the stimulatory tax cuts.
Tax cuts and inequality
Although the republican rhetoric has been that tax cuts will benefit all they haven’t mentioned the distributional consequences. The cuts will reduce the tax burden of the top 0.2% by an average of $278,000 by 2017. This is in contrast to the bottom 20% of earners will get an extra $10 dollar by 2017.