At a farm near Moscow, newly arrived guest workers from India are planting potatoes and cabbages - work closely monitored by central bank analysts as they prepare for board meetings to set interest rates. While in developed economies such as the United States food accounts for about 14% of the basket used to calculate inflation, in Russia it makes up a hefty 40% or so, and surging prices for potatoes and other staples have been a major reason for its tight monetary policy. The central bank trimmed its benchmark rate to 20% on June 6 but even that is around...