Which is why the government wants to change it.

Those of us on enterprise bargains get our wage rises locked in only every three or so years. If we didn't lock in enough in last year's agreement to cover this year's sudden outbreak of inflation, there's nothing much we can do about it for another two or so years.

It's a built-in inertia identified by financial services firm JP Morgan in its attempts to explain to foreign clients why Australian wages growth is so low.

Australian enterprise bargains, JP Morgan explains in a note to clients, both delay wages growth and trim its peaks.

Here's how that came about.

For nearly a century, Australian wages were generally set by judges in state and federal industrial relations tribunals. They had the power to intervene and set an "award" wage for an industry or occupation in which there was a dispute. And it was easy enough for unions and employers to create disputes.

Because they almost always intervened, the tribunals got to ensure that wages didn't move too much relative to each other, and it got an insight on the state of the economy from the government, which made submissions.

From one point of view, the strength of this peculiarly-Australian system of setting wages was that each employer covered by a decision was compelled to deliver the same increase as its competitors, meaning none were disadvantaged.

From another point of view, this strength was becoming a weakness. The weak firms as well as the strong had to pay the increases, whether it was easy or not.

In the early 1990s, perhaps with an eye to the possibility that an incoming Coalition government might make even greater changes, the Keating Labor government changed the law to channel the workers and employers within each workplace into enterprise bargaining.

The tribunals would have a more limited role, checking that each enterprise bargain passed a "better off overall" test, and continuing to set awards that became more like backstops, slipping below what most workers (usually through their unions) were able to negotiate with individual employers.

Workers and unions did well at first, because they were able to get together with employers and nut out ways to save money to pay for wage rises, something they had had little incentive to do when wages were set centrally.

And it was something that could only really be done at the level of each enterprise, because each was different, and it was the workers on the ground who knew how to make it better.

But productivity couldn't be unleashed in the same way forever. After a while, the easy gains had been had. Workers got good pay rises in return for streamlining unwieldy processes at the start, then had few unwieldy processes left to streamline.

Productivity surged during the first decade, until the early 2000s. Then employers became more cautious about granting pay rises, and by the 2010s became good at stringing out negotiations or letting agreements expire, which meant they rolled over as "zombie agreements" without an increase.

As the Business Council explained in a report on the state of enterprise bargaining in 2019, agreements that had lapsed but were still operational came to act "like a wage freeze for some employees".

With union membership down from 40 per cent of workers when enterprise bargaining began to just 14 per cent in 2020, there was little workers on frozen agreements could do to get more, other than fall back on awards, which at least usually climbed with inflation.

It means the system has come to work in a way hardly anyone actually intended. It is acting as a brake on pay rises, while becoming more centralised.

The Reserve Bank says it can see some signs that wages growth is picking up, even in new enterprise agreements, but that it will take some time to flow through to all agreements in general because of the "multi-year duration" of the agreements.

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What Labor is proposing and is about to get through the Senate with the help of the Greens and independent David Pocock is an attempt to bust the inertia.

Expanding multi-employer bargaining will allow employers to bargain knowing their competitors will have to pay what they pay.

Air-conditioning manufacturers have already begun talks with the Australian Manufacturing Workers Union in a bid to drive up workplace standards and pay in a way they know won't be undercut by cheaper competitors.

Allowing employers with genuine ongoing enterprise agreements to escape multi-employer bargaining will encourage more genuine agreements.

And loosening the "better off overall" test will make it easier to get agreements of all kinds registered.

Particularly helpful will be "supported bargaining", in which the Fair Work Commission will itself sit around the table with workers in fields such as childcare who've traditionally found it hard to bargain, where necessary pulling in outside funders (such as the government, for childcare) for talks.

None of it will work miracles. But it should help. And it's unlikely to hurt.