MIDEAST STOCKS-Saudi may end week with firm tone following mega bond debut

Saudi Arabia's stock market may gain on Thursday as investors cheer the kingdom's mammoth international bond sale, which could help to unclog liquidity bottlenecks in the economy, while an overnight rally in oil prices may aid regional markets. London-based Capital Economics estimated the issue would finance around a third of next year's state budget deficit and almost all of the kingdom's current account gap, meaning its foreign exchange reserves were unlikely to fall much further in coming yea