Much is riding on this weekend’s summit of advanced economies, which will be hosted by British Prime Minister Boris Johnson in Cornwall, England.

While the leaders will produce flowery statements that declare unity on key problems and call for concerted actions to fix them, the most important deliverable will be their agreement to promote global corporate tax reform.

There is a long way from a G7 declaration to changes in national tax laws, but a show of unity on this contentious issue would create momentum for reform and remind the world of the G7’s value.