In this study, the existence of multiple bubbles in 15 selected countries is researched by means of the GSADF unit root test developed by Phillips, Shi, and Yu (2015). The data set consists of a weighted average of the monthly price/earnings ratios with the different start dates for countries...

Fama and French introduced a five - Factor Asset Pricing Model (FF5), adding a new perspective to asset pricing models in the literature in 2015. The aim o f this paper is to investigate the validity of Fama French (2015) Five Factor Asset Pricing Model for 18 c ompanies whose shares are listed...