Exponential two-armed bandit problem

We consider exponential two-armed bandit problem in which incomes are described by exponential distribution densities. We develop Bayesian approach and present recursive equation for determination of Bayesian strategy and Bayesian risk. In the limiting case as the control horizon goes to infinity, we obtain the second order partial differential equation in the domain of "close distributions". Results are compared with Gaussian two-armed bandit. It turned out that exponential and Gaussian two-armed bandits have the same description in the limiting case. Since Gaussian two-armed bandit describes the batch processing, this means that in case of exponential two-armed bandit batch processing does not enlarge Bayesian risk in comparison with one-by-one optimal processing as the total number of processed data items goes to infinity.