Murray Rothbard who is not the greatest of economists compared to a Ludwig von Mises, but does a good job debunking the “Long Depression” myth in his History of Money and Banking in the United States (available from Mises.org in hardcover and as a free PDF download http://mises.org/books/historyofmoney.pdf):
Orthodox economic historians have long complained about the “great depression” that is supposed to have struck the United States in the panic of 1873 and lasted for an unprecedented six years, until 1879. Much of this stagnation is supposed to have been caused by a monetary contraction leading to the resumption of specie (gold) payments in 1879. Yet what sort of “depression” is it which saw an extraordinarily large expansion of industry, of railroads, of physical output, of net national product, or real per capita income? As Friedman and Schwartz admit, the decade from 1869 to 1879 saw a 3-percent-per-annum increase in money national product, an outstanding real national product growth of 6.8 percent per year in this period, and a phenomenal rise of 4.5 percent per year in real product per capita. Even the alleged “monetary contraction” never took place, the money supply increasing by 2.7 percent per year in this period. From 1873 through 1878, before another spurt of monetary expansion, the total supply of bank money rose from $1.964 billion to $2.221 billion—a rise of 13.1 percent or 2.6 percent per year. In short, a modest but definite rise, and scarcely a contraction. It should be clear, then, that the “great depression” of the 1870s is merely a myth—a myth brought about by misinterpretation of the fact that prices in general fell sharply during the entire period. Indeed they fell from the end of the Civil War until 1879. Friedman and Schwartz estimated that prices in general fell from 1869 to 1879 by 3.8 percent per annum.
Unfortunately, most historians and economists are conditioned to believe that steadily and sharply falling prices must result in depression: hence their amazement at the obvious prosperity and economic growth during this era. For they have overlooked the fact that in the natural course of events, when government and the banking system do not increase the money supply very rapidly, free-market capitalism will result in an increase of production and economic growth so great as to swamp the increase of money supply. Prices will fall, and the consequences will be not depression or stagnation, but prosperity (since costs are falling, too) economic growth, and the spread of the increased living standard to all the consumers.