We keep coming back to 'It's the economy, stupid'. One of the key problems with the EU (and the UK and the US) is that they are all following the same school of economic ideology which promotes the interests of wealth over the interests of the general population and in which money continually flows upward.
Not only do we have to contend with the almost static situation this engenders, i.e. the poor remain poor, the middling sorts remain middling and the rich get ever richer, but when countries fail to achieve economic growth and go into recession the cure that the ruling ideology implements is to cut state spending on the grounds that it can't be afforded and make the economy and the conditions of all but the wealthy even worse.
This leads to inequality, and resentment among those who don't benefit and makes them vulnerable to populist simplistic, convincing sounding 'solutions' to their problems.
Not that the populists have a solution for their economic woes because they subscribe to the same economic ideology which produced the problem..
I'm currently reading an excellent recent biography of JM Keynes, one if our greatest economists. From post WW1, where he was involved in the negotiations for reparations and repaying of massive US war loans to Britain and our allies, through the Stock Market crash and the Great Depression he constantly advocated spending to recover a failing economy and watched in despair as his advice was ignored and fascism took over in the most impoverished European countries. With the result that Europe was back in full scale war less than 30 years after 'The War to end all Wars'.
The only country to take his advice was the US where Roosevelt's New Deal put an end to the Depression and revitalised the US economy.
Post war Britain, until the late 1970s followed Keynes' precepts and was on a rising tide of prosperity and greater equality until the peculiar circumstances of the '70s made the populace receptive to Thatcher's opposing economic ideology
.