In the film, the Jew Joseph Süss Oppenheimer ("Jud Süss") loans the Duke of Württemburg so much money that it can never possibly be repaid, so, in return, Jews are allowed to flood the Dukedom and privatize all the infrastructure (roads, bridges, etc.).
Everything is paid for many times over, with toll booths every few miles on every road, etc., ruining the economy of the Dukedom and leading to eventual revolution.
It's also a great film. For a synopsis with still photos, see:
Ferdinand Marian as "Jud Süss"
Coming soon to an economy near you
(Based on the "non-famous" book of the same name, by the Jew, Lion Feuchtwanger)
Part-Jewish Pro-Lifer Demands a Retraction and an Apology
Quotes from Ronnie Po-chia Hsia