Arthur Crump, The Theory of Stock Exchange Speculation
“ As at cards so at Stock Exchange speculation, there must be two kinds of luck, ill-luck and good-luck, as the changes of fortune which are worth while taking account of. A man speculates, gets his turn of good luck and pockets his gain, treating the money as if it were ore from a mine, or something added to the realized wealth of the world, a pure plus as compared with a plus leaving a minus. For every profit made by a speculator, and for every realized profit made by a bona fide investor, there must be a corresponding loss. ”
