0228 GMT - Cooper prices are higher in early Asia trade, supported by expectations of tightening supply and improving demand, Everbright Securities analysts write in a note. Domestic copper inventories remain low, while global copper mine supply remains constrained, they add. Spot treatment charges have also fallen to fresh lows, pointing to continued tightness in the concentrate market, they say. Investors are monitoring U.S. copper tariff policy and its potential impact on global trade flows, they add. The three-month LME copper contract is up 0.1% at $14,540.50 a ton.