Roy Davidson, commenting on Liggio's review of Howe and Morgan, says that
"taxation" (not saying what kind) undermines free markets.  He also says
that "land monopoly" is a barrier to free markets.

He seems to be overlooking the extensive literature on using taxation of
land values to offset and overcome the problem of land monopoly, and relieve
commerce, labor, and capital from taxes that really do undermine free
markets. The modern knee-jerk is "Oh, yes, Henry George", but before him
there were John Locke, Baruch Spinoza, Jacob Vanderlint, A.R.J. Turgot,
Francois Quesnay and the Physiocrats, Adam Smith, J.S. Mill, and others.
Contemporary were Philip Wicksteed, Leon Walras, and others. After him came
Harold Hotelling, Bill Vickrey, Lowell Harriss, Dick Netzer, Nicolaus
Tideman, and a host of others - a large host, if we include those many who
get the point but choose not to get heavily involved.

Mason Gaffney