Peak–end rule end. The effects of the duration of an experience upon retrospective evaluation are extremely slight. Fredrickson and Kahneman labeled this phenomenon "duration neglect". The peak–end rule is applicable only when an experience has definite beginning and end periods. A 1993 study titled "When More Pain Is Preferred to Less: Adding a Better End" by Kahneman, Fredrickson, Charles Schreiber, and Donald Redelmeier provided groundbreaking evidence for the peak–end rule. Participants were subjected to two different versions of a single unpleasant experience. The first trial had subjects submerge a hand in 14 °C water for 60 seconds. The second trial had subjects
Uptick rule on 2009-04-08. A modified form of the rule was adopted on 2010-02-24. In 1938, the U.S. Securities and Exchange Commission (SEC) adopted the uptick rule, more formally known as "rule 10a-1", after conducting an inquiry into the effects of concentrated short selling during the market break of 1937. The original rule was implemented when Joseph P. Kennedy, Sr. was SEC commissioner. In 1994, the NASD and Nasdaq adopted their own short sale price tests, known as NASD Rule 3350, based on the last bid rather than on the last reported sale. In 1978, the purpose of the uptick rule was