Oil prices shifted lower to start the week on the back of a fresh round of tariffs placed by Trump on Chinese goods, another contraction-territory print in China’s manufacturing PMI and news that OPEC production increased in August. Prices, however, veered back on Wednesday morning, with WTI rising over 4% as a result of positive economic activity in China’s services sector The trading week began with a thud as Asian markets open Monday morning after President Trump announced another 15% tariff hike on about $110 billion worth of Chinese…