But this will now be applied more widely, with more flexibility over pay levels and progress linked to annual appraisals.

BBC: Teachers' performance pay on pupil progress

Early evidence from those schemes would inform decisions on whether lane rental could usefully be applied more widely, it said.

BBC: Lane rental scheme for digging up roads proposed

Mr. Biden suggested that background checks be applied even more widely, to all private sales, wherever they occur.

WSJ: Biden's Emerging Gun Plan Draws NRA Ire

And how widely can it be applied?

CNN: Are we heading for a human-powered future?

How widely could this idea be applied?

ECONOMIST: Internet search data may be useful for forecasters