Peisistratos financed a majority of the upgrades in Athens through silver mines to pay for the construction that came with the newly expanding political culture. "Most of the revenues were gained from the mines of Mount Pangaeum". According to the "Encyclopedia Britannica" the silver mines of Laurium were state property, and all dues were exacted from the growing trade at Athenian harbours. Another route of financing that Peisistratos pursued was a tax which was focused on the agriculture sectors. This tax was estimated to be around 5%. All of the money produced through these sources was instrumental in developing the Athenian economy, setting it up for success throughout the latter 6th century. In addition to this his political movements to protect immigrants and improve the quality of life in Athens were very important in maintaining their strong economy.