Which two concepts are best illustrated by the following passage from a January 29, 2008, report in The New York Times about Société General trader Jerome Kevel, whose trading misconduct eventually led the bank to lose more than $7 billion? "Over time, Mr. Kevel had increased the size of his bets - he hedged his positions on paper with falsified documents and e-mail messages - but he remained convinced that success was just around the corner. 'He bet on the return of the markets that wer...