You probably thought I was kidding last week when I said that, after dissecting the pros and cons of the value-added tax, we’d turn our attention to the flat tax. And I may have been. But the thoughtful responses we got have encouraged me to press on with our tax seminar. So what about that flat tax? Essentially, it would junk the convoluted tax code and impose a single rate on individual and business income. You could file your return on a postcard. Supporters say it would eliminate the distorting behavior of loopholes and deductions, promoting economic growth as people looked for productive investments instead of tax-avoiding ones. Is it that simple? Give me your thoughts on the flat tax at firstname.lastname@example.org. And maybe next week we’ll look at that Fair Tax scheme.