Turkish president Recep Tayip Erdogan said Saturday the commitment and determination of Turks is the guarantee needed to combat attacks on Turkey’s economy. According to Reuters, Turkey’s lira has tumbled some 40 percent this year. Investors are concerned by Erdogan’s grip on monetary policy, and a growing dispute with the United States has put pressure on the currency. Erdogan has cast the rapid deterioration of the lira as an “economic war.