The IIASA CIM Project has collected a world-wide database of FM-systems. This paper is the second one (for the first paper, see IIASA WP-88-029) analyzing the properties, benefits and trends of FM-systems based on version 2 of the database (comprising about 400 systems). The paper focuses on the rain economic features and impacts of FM-systems. It clusters and correlates different indicators trying to explain the factors behind the achieved benefits. The paper presents new results and features of FM-systems.