But when it comes to working out whether such facilities are empty or full, whether the agents are stable or what type they are, analysts are often guessing.
Sadly for Labour, this is an experimental proposition that cannot be tested: Mr Cameron inherited coffers that are empty, not full.
The newsroom inside seems to contain more empty desks than full ones.
Employers have also realized they can scrape by with fewer workers, so instead of filling empty jobs with full-time staff, they rely on temporary or contract employees.
Once you've started charging for empty premises in full, and apart from new business premises being built, it's hard to see how business rates revenue can be lifted, buoyantly, by economic growth.
Picture this: a stately room full of empty chairs set up two rows deep in a semi circle.
In the commercial, a seemingly empty city is actually full of people who blend in perfectly with their surroundings.
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He opened up his new place, Stanley's(ph), even before the Quarter officially reopened, an oasis on a street full of empty storefronts.
So you are born thinking the glass is half-empty or half-full.
But they came away empty-handed after full-back Blair struck a post with a simple penalty and Australian fly-half Sam Norton-Knight was wide with a drop-goal attempt.
Rail cars that should have been full arrived empty, and an operator error threw a network carrying 200, 000 of them into gridlock, snarling traffic along the east coast.
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Dan Harris of the China Law Blog (and one of our China Tracker contributors), responding to another bullish commentary, says the glass is half empty, not half full.
Such materials could be used to make hydrogen cartridges that would slot into fuel-cell cars, making refuelling as simple as pulling into a filling station and swapping an empty cartridge for a full one.
He would, they said, have been better off making sure that the funding Wales gets from Europe is spent more effectively, "creating a dynamic trading relationship with our EU partners ... rather than going to Brussels full of empty words and tired rhetoric about Europe".
Arguments over the economy and the impact of tomorrow's budget on Wales were rehearsed today - because tomorrow, the chamber will be empty - or should I say under half full, or is that over half empty?. Labour and Plaid Cymru AMs (including the Presiding Officer, though not, apparently, including Dafydd Elis Thomas) are staying away.
He would locate an empty can one day, full of holes, and save it.
It depends on whether you see the glass half full or half empty.
But is the glass half full or half empty?
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However, Mr Maginness's leader, Alastair McDonnell, later issued a statement in which he qualified his party's welcome for the breakthrough, talking about the Girdwood glass being both half full and half empty.
As proof positive of that glass-half-empty or glass-half-full viewpoints are universal, some witches are hexing away.
Two new books disagree on whether the hedge-fund managers' golden chalice is half-full or half-empty.
The first to attract patrons attracts more patrons until one might be full and the other empty.
"In terms of a coach, he's very much glass half-empty rather than glass half-full, " said Mark Lawrenson, the former Liverpool defender.
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"The bars are full of souls so empty, " a barefoot Criolo sang in Central Park, wearing a yellow guayabera and white slacks, to an arm-waving crowd.
This empty spot is, however, full of big ambitions.
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In ground-based images, the patch of sky (just one-tenth the diameter of the full Moon) is largely empty.
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The start was delayed 91 minutes by steady showers, thinning a crowd of 31, 877 that left full sections of seats nearly empty.
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