RDP 2016-09: Why Do Companies Fail? Equation

S( t )= Π t k | t k <t ( n k d k n k ) MathType@MTEF@5@5@+=feaagCart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaam4uamaabmaabaGaamiDaaGaayjkaiaawMcaaiabg2da9maaxababaGaaeiOdaWcbaGaamiDamaaBaaameaacaWGRbaabeaaliaacYhacaWG0bWaaSbaaWqaaiaadUgaaeqaaSGaeyipaWJaamiDaaqabaGcdaqadaqaamaalaaabaGaamOBamaaBaaaleaacaWGRbaabeaakiabgkHiTiaadsgadaWgaaWcbaGaam4AaaqabaaakeaacaWGUbWaaSbaaSqaaiaadUgaaeqaaaaaaOGaayjkaiaawMcaaaaa@4BC3@