President Francois Hollande recently increased the top income tax rate in France to 75 percent -- for incomes in excess of €1 million. This is part of a wider trend with President Obama targeting the wealthy in his election campaign, promising to raise taxes on incomes in excess of $1 million. Shifting the tax burden onto the wealthy might be clever politics, but does it make economic sense? To gauge the effectiveness of this strategy we need to study tax rates and their effect on incomes in the 1920s and 1930s.

By the end of the First World War, Federal government debt had soared to $25.5 billion, from $3 billion in 1915. Income taxes were raised to repay public debt: 60 percent on incomes greater than $100,000 and a top rate of 73 percent on incomes over $1 million. When Andrew Mellon was appointed Treasury Secretary in 1921, he inherited an economy in sharp recession. Falling GDP and declining income tax receipts led Mellon to observe that "73% of nothing is nothing". He understood that high income taxes discourage entrepreneurs, leading to lower incomes and lower tax receipts -- what we now refer to as the Laffer curve. By 1925, under President Coolidge, Mellon had slashed income taxes to a top rate of 25 percent -- on incomes greater than $100,000. The economy boomed, tax collections recovered despite lower rates, and Treasury returned budget surpluses throughout the 1920s.

Interestingly, Veronique de Rugy points out that taxes paid by those with incomes over $100,000 more than doubled by the end of the decade.

Andrew Mellon was a wealthy banker and investor: in the mid-1920s he was the third highest taxpayer in the US. His strategy of cutting income tax rates may appear self-interested, but showed an understanding of how taxes can stimulate or impede economic growth, and succeeded in rescuing the economy from prolonged recession in the 1920s.

A decade later, President Herbert Hoover spent liberally on infrastructure programs in an attempt to shock the economy out of recession following the 1929 Wall Street crash. By 1932 Hoover and Mellon raised income taxes to rein in the growing deficit. Tax on incomes greater than $100,000 was increased to 56 percent and the top rate lifted to 63 percent -- on incomes over $1 million.

The budget deficit continued to grow. Higher tax rates were maintained throughout the 1930s, under FDR, but failed to achieve their stated aim and may have contributed to the severity of the Great Depression.

GDP rose steeply after 1934. Income tax receipts recovered to pre-crash levels but declined again after 1937, when President Roosevelt introduced payroll taxes. Increased taxes reduced the fiscal deficit but caused a double-dip recession: GDP contracted, income tax receipts fell and the deficit grew.

Comparing the 1920s to the 1930s it is evident that Barack Obama and Francois Hollande threaten to repeat the mistakes of the 1930s. Increasing taxes in the middle of a recession does not reduce the deficit. It merely prolongs the recession.