This book is the third one of “Discussions between Economic Agents” series. The subject- time series analysis- is
totally used as a key point in each paper. A time series data set consists of two or more variables over time. So, time series data can have different time frequencies, such as hourly, weekly, quarterly and annual. Moreover, these data have to be
arranged in chronological order. Most of the economic variable has been influenced by the past values of itself. That is these variables are integrated according to the influenced period times. If there is only one lag, we say it is I(1) i.e. integrated in first difference. Otherwise, if there is no influence from past to nominal value, the variable is called as stationary. To see whether the variable is stationary or has a unit root, a unit root test has to be applied. Such as, Augmented Dickey Fuller), Phillips Perron, Kwiatkowski-Phillips-Schmidt-Shin, Ng-Perron, Lee-Strazicich and etc. Following this test, according to the variables properties ordinary least square, cointegration and error correction analysis are done. In this context, the articles mentioned in the following paragraphs are related via the time series. There are seven valuable works in the book.