Haldeman, Joe. "No Future in It"
Divergence: c 1900 CE
Summary: In a bar discussion, a man claims to have traveled back in time and invested in all the right scientific inventions, but it didn't work.
Published: In Omni, April 1979; The Best of Omni Science Fiction (ed. Ben Bova), Omni 1980; and Dealing in Futures: Stories, Viking 1985 (0670806358), Futura/Orbit 1986 (0708881971), Macdonald 1986 (0356121860), SFBC 1986, Ace 1986 (0441141390), Penguin/Roc 1993 (045145258), Easton 1988.