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To understand what the macros are doing, you need to know that function
calls push argument values onto a stack. When
construct_trade is called with both a price argument and a number
argument, the stack looks like this:
*-- The argument count
|
| *-- The price
| |
| | *-- The number of shares
| | |
v v v
------- --------------- -------
--*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
| | | | | | | | | | | | | | | | | | | | | | | | | |
-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*--