I don't quite understand the phrase in bold:
"This is a very high scoring wine from what will certainly prove to be in the top three vintages of all time," he said. "At the moment, we are talking to a lot of people about positions on Lafite because prices have come down so far it really looks like there is a very considerable upside."
source: http://www.cnbc.com/2016/08/10/wine-investing-may-be-your-tipple-of-choice.html
Best Answer
In this context, a position is a financial term:
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:
Buying wine and then selling it again six months later with a 125% increase would definitely count as a profitable position.