A Decision on the Keystone XL Pipeline and Black Friday Salesbr Here’s what to expect in the week ahead:br Nebraska’s Public Service Commission is scheduled to decide on Monday whether to grant a permit for the building of a section of the Keystone XL pipelinebr that would connect Canadian oil with refineries on the Gulf Coast.br A leak in the existing Keystone pipeline last week, which spilled 5,000 barrels of oil on a farm field,br was an embarrassment for the Canadian pipeline company TransCanada, which owns both pipelines.br The topic is timely; some economists worry that financial minefields could come into view as the European Central Bankbr and the Federal Reserve slowly withdraw the stimulus they have been providing for the past decade.br Janet Yellen, now in her final months as chairwoman of the Federal Reserve, will be interviewedbr by Mervyn King, former governor of the Bank of England, at New York University.br The University of Illinois Extension estimates that people will eat a total of 46 million turkeys for the holiday, though official numbers on stuffingbr and mashed potato consumption are less readily available.