In the past decade several studies have been published in Hungary as well on the role of foreign working capital investment and the economic effects of the presence of multinational companies. This paper explores what role working capital investments (their type, size etc.) have played in the transformation and modernization of Hungary and in her integration into world trade. After a short theoretical and historical survey it presents the experience of some European countries which the literature often mentions by comparing them to Hungary, for on the basis of their size, population, geographical location and level of economic development they have often met similar economic policy dilemmas and choice-making. Then it examines what effects foreign working capital influx had on the given economies and - ina wider sense - on their social development, and in addition, what kinds of undesirable consequences it had.