The correct answer to this open question is the following.
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The reliance on civil servants to manage tax collection in the Roman Empire is an example of a political characteristic of the Roman Empire.
Taxation was not a heavy burden for Roman citizens in the Roman Republic, just for the Roman farmers who complained about the lucrative business generated by the heavy taxation. However, Emperor Augustus modified the taxation system at the beginning of the Empire. Direct taxation replaced farming taxation and from now on, provinces were obligated to pay a 1% tax for wealth.
