PT - JOURNAL ARTICLE AU - Laurence B. Siegel TI - Introduction: A Challenge that Financial Markets Have Never Faced Before AID - 10.3905/pa.2015.1.jor.intro DP - 2015 Jan 31 TA - Practical Applications PG - 1--2 VI - 1 IP - JOR 4099 - https://pm-research.com/content/1/JOR/1.7.short 4100 - https://pm-research.com/content/1/JOR/1.7.full