In Reply to: I agree posted by Keziah on Tuesday, 17. March 2009 at 06:39 Bali Time:
There is no single world currency.
You always need to check what currency flight prices are denominated in. Be it Singapore $, Aussie $, US $, Euros, Ringits, Rupiah etc.
If you are going to book on the internet machine, your own basic flights and avoid using a travel agent then you need to be vigilant and double check everything because you dont have many rights once you push the confirm payment button.
As for one way flights being expensive, they probably are compared to two way promotional deals. BUT REMEMBER In the past if you didnt know a return date or had to have outgoing passage arranged to gain access to a country you had to pay full fare on a refundable/transferrable flight.
Buyer beware.
Michael