In this context, a position is a financial term:
A position is the amount of a security, commodity or currency that is owned (a long position) or borrowed and then sold (a short position) by an individual, institution or dealer. A position can be profitable or unprofitable, depending on market movements. The practice of restating the value of a position based on its current value is called mark-to-market.
So positions on Lafite means investing money in Chateau Lafite wine- one of the elite premier grand crus - first growth clarets. It may well be a good investment opportunity:
Recently the 2008 vintage produced a worldwide increase in price of over 125% in 6 months from release, which in turn has come to push some Asian countries to the top of the list of worldwide markets in which investment grade wine is purchased.
Buying wine and then selling it again six months later with a 125% increase would definitely count as a profitable position.