2 things I want to make clear after receiving a couple different PMs —
1. First of all, part time careers DO NOT count towards the multiplier. Only full length careers and professions (daycare profession is considered full length)
2. Second, I have already stated that you can take objects you purchase for your 4 item limit with you to another house. So, let's say you buy a nice fridge for house #1. You can pack it up and move it to house #2. You can still buy 4 more objects for house #2, but remember that you are limited to placing/changing 4 objects per house. In other words you cannot plop down 20 expensive objects at the last house. It's still 4.