On the left or on the right: what does this mean these days?

The right with the workers, the left with the multinationals. Giorgio Gaber would be in crisis today, if he were to sing "What is right, what is left." Old certainties have collapsed, one after the other. And so the billionaire Donald Trump, Republican and conservative, won thanks to the anti-establishment vote at the expense of Democrat Hillary Clinton, seen as the guarantor of the interests of Wall Street. And while the leader of the Italian left, Matteo Renzi, flew to America choosing as inspiration the high priests of Silicon Valley, the Italian right rides popular anger with criticism of the single currency and the European Union.

The ideological boundaries that once separated the parties of the left and right are increasingly fragile and confused. Does it still makes sense to speak of left and right? What are the core values - if any - that remain for both right and left?