unlike a simple commodity market, like coffee for example, where a buyer can say "these prices are too high, i'm not going to buy any", a worker cannot simply say, "these wages are too low, i'm not going to work". (unless the government plans to give them all sufficient social security so that they can live comfortably without any work, which is unlikely and probably undesirable.)
likewise, when a coffee producer sells a lot due to good prices, he will increase his production, and thus the supply. in the labor market, a company that seeks workers and offers them a great wage will easily find workers, but i find it incredible that it's managers will then think "hey, we had such a great demand for work, let's hire more people just because of that!" it will not increase demand, limiting the effect a single positive agent can have.
not every market is exactly the same, and considering the dynamics of various markets will enable you to understand why so many countries have minimum wage, why they subsidize food production and are very interested in influencing the prices of basic commodities, and why they often meddle in real estate. these are things people simply cannot do without, and the stability of governments and regimes depends on somehow ensuring them for as many people as possible.