Hi,

Just curious.
I was wondering how things work in the following scenario:

Lets say on some exchange, the following order book is hanging there for a while:

Sell Price	Buy Price
$11	$10
$12	$9
$13	$8

No suddenly someone shoots in a sell order for $9.
I assume this will match wil the oldest buy order. The one at the top Right?
So the person who put up the buy order of $10, wil get it.

So my question is... Is the buyer paying $10 or $9?

And what will the seller get?

Are there any standards for this? Meaning, do all exchanges work the same?