In his target article Lockhead calls attention to numerous complications that prevent a valid straightforward or Fechnerian interpretation of psychophysical data. Here I describe three additional sources of bias, all involving the influence of stimuli presented before the start of an investigation.

David Ricardo was a hugely influential British political economist and stock trader. This volume, first published in 1923, contains five important pamphlets published by him, edited and with an overarching introductory essay by E. C. K. Gonner. Each essay relates either to monetary and financial subjects - including the high price of Bullion, monetary theory and the position of the Bank of England - or to the agricultural conditions of Britain and proposed solutions to the problems discussed. This is a (...) fascinating and detailed work, which will be of great value to those with an interest in Ricardo’s theories and British economic history. (shrink)