But this is also about the prospective employee. Your forecast, to start. Marv knocks on your door. Marv goes away, never to return. Tomorrow you post the accounting job.
Markets work best if boh sides of an exchange have the same info, fresh and accurate.
These kinds of markets, spot markets, are subject to dramatic fluctuations in price and volume. Forward or futures markets help everyone plan, putting today's market in a context of possible tomorrows. Same for labor markets. In the US, the Department of Labor provides broad guesses of employment for various industries and occupations. We'll need fewer steel workers over the next ten years, for example.