are time series stationary what is the relationship between price and return when calculating time series, we will see the return series of financial assets. when can we do a time series for price is it always a good idea to model only a return time series of financial assets? what is the purpose of a time series in finance? are time series stationary are time series fixed or fixed what is the model time series why is it useful to model time series of financial assets? how to model a time series what is the difference between financial time series and return are return time series always stationary are time series stationary in financial modeling time series are stationary are financial time series stationary are price times series stationary? why is it necessary to model returns in financial time series are return and return series of financial assets are investment time series stationary