You have my attention. What do you have in mind?
Here's a good start. It's a very interesting read, I think. While I'm not going to deny that I am personally against the ACA, nobody can really deny that all the provisions and restrictions involved have an elegant relationship on each other. They're all necessary to support everything else, and the entire ACA becomes economically/mathematically faulty as soon as you remove any of the details.
You all have the ability to read, so I won't talk about that pdf. Read it if you want, but here's a dumbed down example:
An insurance company has four policyholders for the next year, and there are no regulations on the discrimination of pricing (excluding race). The insurance company is free to charge all individuals whatever they want based on whatever factors they want. The insureds are:
Taylor - 22yo - Male - Unhealthier than average
Rex - 22yo - Male - Healthier than average
Hannah - 22yo - Female - Unhealthier than average
Gina - 22yo - Female - Healthier than average
The insurance company will charge these individuals what they would expect an average person with their three characteristics to cost. Empirical evidence shows that females cost more than males, and common sense shows unhealthy people cost more than healthy people. So let's say the insurance company comes up with and charges:
Taylor: $30
Rex: $15
Hannah: $35
Gina: $20
The insurance company collects a total of $100 that will be used to pay all claims of all four individuals. But when the next year comes, the ACA restricts insurers from charging anyone the same age a different rate. No matter what the law says, the underlying expected costs for each individual is still the same. The company still expects to pay $100 of claims throughout the year, so now they'll charge:
Taylor: $25 (decrease of $5)
Rex: $25 (increase of $10)
Hannah: $25 (decrease of $10)
Gina: $25 (increase of $5)
Some insured's premiums went up from one year to the next based only on the restrictions within the ACA, while some went down. But the change in the insurance pool did not change. I'd say that's about as close to the definition of redistribution as you can get. Here's a direct quote from the executive summary:
The impact on specific individuals will vary significantly depending on their age, gender, location, health status, income level, and what coverage they have today. The report found that “young, healthy males could see substantial increases due to the combination of the overall rate change and the age/gender rating requirements” while “older, less healthy individuals could see rate reductions.”