21.   The union has threatened to go on strike as early as Friday to demand higher wages.

22.   They have nothing to lose by demanding higher wages.

23.   They were fired when they formed a union to demand their wages.

24.   They are also demanding higher wages.

25.   Traditionally, economists fear a tight labor market will lead workers to demand higher wages, which will lead to higher prices and an inflationary spiral.

26.   When they finally demanded their back wages, they were dismissed.

27.   While businesses are competiting hard for scarce workers, the survey said, workers have not been able to demand higher wages.

28.   Widespread publicity about layoffs has created a climate of insecurity that could keep workers from demanding higher wages.

29.   Without these provisions, critics say, foreign workers cannot demand higher wages, and companies can avoid environmental costs that US companies incur at home.

30.   Workers may then demand higher wages, and companies may raise prices to meet that demand and still maintain profit margins.