An OPEC flag sits on a table ahead of the meeting in Vienna on Thursday. VIENNA—OPEC broke off its meeting on Thursday without reaching an agreement on oil production , continuing a hands-off policy that members say could set up a new test for the group’s relevance: supply shortages. With oil prices up about 80% over the past few months from 13-year lows hit in the winter, there was little pressure on the Organization of the Petroleum Exporting Countries to take significant action to curb the world’s huge oversupply of crude, national energy ministers said after the meeting. Oil prices rose 0.3% on Thursday after the meeting, as investors looked past the OPEC decision and traded up on new data showing a drop in U.S. oil production. Oil prices had climbed on Wednesday as some OPEC members floated the idea of reintroducing collective production limits, which would serve as […]