The first objective of this paper is to formulate a management simulation model of annual cost and revenue of the third sector type wholesale market under a given condition. The second objective is to identify the conditions that assure a balance between the cost and revenue in the long run by applying this simulation model to a wholesale market of the third sector type. The conditions found were as follows: 1. In the 20 years period case analyzed in this paper, users' fee must be increased by 15% and minimize the long term loan of the wholesale market. 2. The province and local governments which are parts of the third sector type wholesale market must invest capital as much as possible. 3. The market establisher must provide functions and benefits in the wholesale market to the extent that the users will accept the increase of the users' fee.