We are also seeing Russian and Brazilian buyers coming back as their economy improves and currencies are strengthening in relation to the dollar. (opp.today)
The largest impact can be seen when looking at the relative performance of U.S. and foreign equities in relation to the dollar. (awealthofcommonsense.com)
This is perhaps due to the recent drop in the value of the peso in relation to the dollar (the currency in which most works were priced), thus leaving collectors awaiting the fair's end to decide on the best set of works to bring home. (artsy.net)