GASOLINE PRICES will increase by P0.50 per liter (/L) this week, oil companies said, marking the sixth straight week that the cost of the petroleum product has risen. Diesel prices will also increase, by P0.15/L, while kerosene will rise by P0.20/L. All the companies that sent their advisories as of late afternoon on Monday said they would hike pump prices at 6:00 a.m. today. In the last six weeks, diesel and kerosene have risen five times, broken only by a week of respite when prices stayed unchanged. — Victor V. Saulon