The economy is ruined! So many shops!
Logic aside, this game brings a lot of new gameplay to the series and lots of new interactions and objects. I won't go into them now because it'll take up half a million km of web pages.
The new gameplay is what I'm here to talk about. Your sim can buy a home business and open/close it any time they want to. They can also buy real estate but this is difficult because it is so darn expensive! The only way I managed to buy even the smallest shop is by getting a huge inheritance and a large insurance claim when a burglar came! When you have a business, you can hire and fire your employees, as well as look after them, raise their pay and such. You can also now craft items, and yes, there are yet more progress bars and awards so you can make better items when you're more experienced. You get talent badges, going from bronze to gold. You can get these badges in Hairdressing, sales, robot making, toy making, flower arranging and till operating. This will inspire the user to keep gaining skills for their Sim.
The whole business thing is quite simple, and it's not hard to make a bit of money, but it's still very fun.