The 90-day freeze became nearly 1,000 days of measures known as Phases One, Two, Three, and Four, ending in 1973. In these phases, the controls were applied almost entirely to the biggest corporations and labor unions, which were seen as having price-setting power. However, 93% of requested price increases were granted and seen as necessary to meet costs. With such monopoly power, some economists saw controls as possibly working effectively (though they are usually skeptical on the issue of controls). Because controls of this sort can calm inflationary expectations, this was seen as a serious blow against stagflation.