Cheaper oil prices since 2014 have probably been of little net benefit to the global economy and may even have been a drag on growth, according to the European Central Bank. “While most of the oil-price decline in 2014 could be explained by the significant increase in the supply of oil, more recently the lower price has reflected weaker global demand,” the ECB said on Monday in an article from its Economic Bulletin. “Although the low oil price may still support domestic demand through rising real incomes in net oil-importing countries, it would not necessarily offset the broader effects of weaker global demand.” The analysis strikes at the ECB’s debate over whether it should be adding monetary stimulus to the euro-area economy as lower heating and fuel bills give consumers more spending power. President Mario Draghi has argued that as well as depressing inflation — the ECB’s main challenge […]