Oil prices inch higher, one-month supply cut extension falls short of market hopes

SINGAPORE (Reuters) - Oil crept higher on Monday, but gave up big early gains as optimism over major crude producers' deal to extend record output cuts gave way to disappointment that the accord didn't extend beyond the end of July.Brent crude had climbed as high as $43.41 a barrel but by 0239 GMT was trading up just 21 cents, or 0.5%, at $42.51. U.S. West Texas Intermediate (WTI) crude rose 2 cents, or 0.05%, to $39.57 a barrel, after earlier touching $40.44 earlier. Both hit their highest..