What's the idea of release singles after albums?

[slashess]

well...I believe...

because the albums over in Japan are a lot more expensive there than they are here in America. We do have singles here in America but we don't really take time to promote them because they're only like 6 dollars and albums are about 15 dollars, so yeah.

And in Japan the singles are about 10 dollars and the albums are about 25 dollars, and perhaps someone wants a single more than an album as well (like for instance, someone only liked Poker Face from A song for XX but didnt like any of the other songs promoted)

thats what I think

ps: I thought the CDs in Japan were Super Expensive compared to americans' cds.