WHY, ACCORDING TO LEIBNIZ, DO WE LIVE IN THE BEST OF POSSIBLE WORLDS?

My purpose in this work is to show the main trait, according to Leibniz, of the best of the possible worlds. In it there is the best combination of plurality and unity. The concept of serie is used by Leibniz to express that synthesis of abondance of effects and parsimony of means. The best of the possible worlds is intersected - although not full of them-by a infinity of series, each of them having infinite variations. Leibniz says that there is no disruption in the inner of every serie, and I sugest that his sentence has two complementary meanings: first, between two cases of one serie there is another case; second, every case of one serie is in the middle of others cases. So, there is neither maximum nor minimum in the best of the possible worlds, or, as is thought by Leibniz, it is possible always to go up and down.