rtw prices are local prices in local currencies.
when the US$ declined some years ago (against the SFr from an exchange rate of 1.82 down to 1.15, right now it is at 1.30) rtw prices in the US did increase several times while they where stabile (in our local SFR currency) here in Switzerland.
There was no price change for rtw tickets in and ex Switzerland for more than 12 months now.