As they have been forced more and more into trade, peddling and money lending, Jews are admitted to towns for limited periods only when economic development demands more trade and credit. They have to pay extra taxes. When the economic situation changes or local merchants have fallen too deeply into debts, the permits are not extended. Often, Jews are simply expelled.
Many communities have to pay taxes to the king or prince in return for their protection.
In the German states, Jews are considered property of the emperor who sells the right to tax them to local princes and bishops.