According to roediger and mcdermott, what memory task results in superior performance?

Roediger and Mcdermott performed an experiment with over 60 test subjects that were exposed in different stimuli. In their experiment they concluded that there must have been a trade-off of between the false memory susceptibility and categorization ability and that the superior performance on one will relate to having superior performance to the other. 

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.