As leaders of the world’s 20 most powerful nations congratulate themselves on plans to boost economic growth, a closer look at their 800-plus policy proposals reveals a catalogue of measures that are either old, vague or unlikely to be implemented.

Australia, the hosts of the Group of 20 meeting, claimed credit for a year-long effort to get members to adopt “extra” reforms that would add $2 trillion to the world economy and create millions of new jobs. Prime Minister Tony Abbott said the plans would make the whole planet “better off”.

Not everyone shared that prognosis.

“Basically it appears to be a collection of wish lists presented from each country,” said Sakong Il, who chaired a presidential committee to prepare for the Seoul G20 summit meeting in 2010.

The OECD made a brave stab at estimating that the 620-odd pages of reforms could add 2.1 percentage points to global economic output by 2018, but only if fully delivered, but acknowledged a “high degree of uncertainty”.

Australia itself put forward many measures first touted in a general election over a year ago, some of which are stuck in parliament .

The United States’ offering, the second shortest at just 15 pages, began with an increase in the government’s spending ceiling, a measure passed as long ago as December last year. Most of the remaining proposals need approval from Congress, an optimistic assumption now that both houses are controlled by President Barack Obama’s Republican opponents.

One measure, comprehensive immigration reform, is so anathema to Repub­licans that Obama may have to use executive action to force through even a limited package.

Illustrative of the overall theme was South Korea’s contribution, which stretched to 114 policy measures under 33 categories over 30 pages. All were a repeat of what the government has announced since the current finance minister took office in July.

The thrust of Beijing’s commitments were a repeat of its own 3rd plenum reform plans, and key proposals from Indonesia on funding for infrastructure date back to late last year.

Reuters’ analysis showed no new commitments from governments in Germany, Britain, France, Italy or Spain over and above what was already in train.

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