Suppose two economists are debating tax reform bill. Both economists agree that the bill would increase the after-tax income of the top 5% of income earners. However, they disagree on whether the bill would improve the tax system. Which of the following is the most plausible reason for why these economists disagree?a) A lack of evidence about the long-run impact of the proposed bill.b) Differences in methodology.c) Different choices about the right simplifications to use in economic analysis.d) Differences in values.