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I have to say, I agree with the Guardian: this article strikes the right note. The nature of modern unionism has changed, something that is recognised by the TUC, but there are still workers being exploited, particularly in the gig economy, and on that basis there's still a role for unions.

Trade union density is measured by the percentage of employees that are members of a trade union. Over the last twenty years, trade union density has fallen by nearly 8 per cent. In 2015, only a quarter of people in work were members of a trade union.