This is an issue that we continually look at in terms of competitiveness. In 2017, as I'm sure you are aware, the United States introduced quite a comprehensive tax reform, and the department spent a fair degree of time analyzing that—and continues to do so, in fact, because some of the details of it are still coming out. It's a dynamic environment, and I think you need to continue to look at it.
In the fall economic update of 2018, the government announced measures in response to that, essentially the accelerated investment incentive. That was focused on a number of things. It focused on a concept, the marginal effective tax rate, which is essentially a measure we use—not the only measure, but one measure—to look at the relative competitiveness of tax systems. Essentially that measures the total tax burden on an investment producing a normal rate of return and takes into account the entire picture of taxes. It takes into account the sales tax burden, the income tax burden and so on. It's a useful measure because it gives you one perspective on that. Those measures allowed us to bring our marginal effective tax rate down a number of percentage points below that of the U.S., to be the lowest rate in the G7.
I think that's one measure. I think it's important to look at a number of measures, but it's an area we continue to be focused on in terms of the overall competitiveness of the tax system being one element—an important element but not the only element—in terms of assessing the competitiveness of the overall economy.