pˈoʊstmˈɑːɹkɪt sˌɪmjʊlˈeɪʃənz wɪð bˈɑːksspɹˈɛdz ɔnðɪ ˈɛs ænd pˈiː fˈaɪvhˈʌndɹɪd ˈɪndɛks ʃˈoʊ ðæt mˈɑːɹkɪt ɪnˈɛfiənsi ɪŋkɹˈiːst ˈæftɚ ðə nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi sˈɛvən kɹˈæʃ.
Post-market simulations with box-spreads on the S&P 500 Index show that market ineffiency increased after the 1987 crash.