 According to Professor Dale Jorgenson of Harvard University’s Economics Department, revenues to Social Security and Medicare would double as the size of the economy doubles within 15 years after passage of the FairTax.Wall Street Journal columnist James Taranto states the FairTax is unsuited to take advantage of supply-side effects and would create a powerful disincentive to spend money.Opponents offer a Nathan Associates study commissioned by the National Retail Federation in 2000 that found a national sales tax bill filed by Billy Tauzin (Individual Tax Freedom Act) would bring a 3 year decline in the economy, a 4 year decline in employment and an 8 year decline in consumer spending.