Brexit was absolutely about Economic conditions. Anti immigration sentiment was one big factor that everyone talks about, but in reality the sentiment itself was a symptom on display for the underlying condition of people having their living standards drop. The second big factor people kept bringing up was that EU was making decisions for UK, which people thought needed to be reversed. Austerity measures, which EU adopted, were the single biggest reason why people felt they needed more control. They also slowed down the post 2008 recovery, which meant people weren’t doing as well anymore. Anti immigration sentiment also rose once people were unhappy and needed someone to take the blame.