SHANGHAI, Jan 20 (SMM) – The increase of non-ferrous metal prices is mainly driven by the optimism about China's economic recovery and the expectation for a falling US dollar index. As the Chinese New Year holiday starts in the coming week, the trading in the domestic market will be suspended, while the overseas market will be unaffected. Since no market data will be available during the holiday to contradict the upbeat sentiment about China's economic recovery, the market players will continue to trade frequently out of optimistic expectations and based on weak fundamentals. As such, zinc prices are expected to fluctuate at high levels.