Magnate Act II Objective
Corner the Market...
Advance 
1 each time you gain a Monopoly card from the supply.
Players can gain Monopolies as described on the Gain Monopolies edict in the rules booklet.
...And Hold It
At the end of a chapter, advance 1 for each Monopoly card you have.
Act: 2
Q: Do I advance with Corner the Market if I take a Monopoly from another player?
A: No. You have to take it from the supply.