# 1. a no-commodity amount with a unit price
bin/hledger -f - print
<<<
2010/1/1 x
    a  1 @ $2
    b

>>>
2010/01/01 x
    a        1 @ $2
    b       -1 @ $2

# 2. with a total price
bin/hledger -f - print
<<<
2010/1/1 x
    a  2 @@ $2
    b

>>>
2010/01/01 x
    a       2 @@ $2
    b      -2 @@ $2