Obamacare’s health insurance exchanges open for business Nov. 1. Millions of Americans will soon have to log on to the digital state or federal marketplace to pick their plans for 2016. They’re in for a rude awakening. Obamacare is set to make insurance a lot more expensive next year. The law will increase its punishment for those who don’t obtain insurance. Many who do buy coverage on Obamacare’s exchanges will face premium hikes as high as 49 percent. Thousands of medium-size employers, meanwhile, will for the first time be subject to penalties if they do not offer coverage to their employees.