hey aquarian93
i meant that they hav questions asking u to suggest *additional* information u would need to know to support a conclusion given in the passage - try to study past papers' mark schemes to find out *how* to answer these questions, for example make sure you DO NOT list points, u'll only score half the marks even if points r correct, and a conclusion is usually worth 2-3 points.
oh and to the "size of firm" you can add -
1) Age of firm
2) Type of firm (joint stock, sole trader, etc)
3) Whether or not owners decide to experience economies of scale
4) availability of capital