Ethical Issue: they took advantage of a loophole in the market rules governing energy trading in California.
SOURCE:
https://www.ccsenet.org/journal/index.php/ijbm/article/viewFile/7627/5855.
https://pubs.aeaweb.org/doi/pdfplus/10.1257/089533003765888403
https://leeds-faculty.colorado.edu/durhamg/fnce3010/enron.pdf
https://www.ejournal.unam.mx/rca/218/RCA21802.pdf
A short essay of two paragraphs (150 words maximum each one) 300 limit words.