Sticking to the supply-demand theme...decline in union participation could also come as a result of bad experiences with unions over leveraging their positions

Sticking to the supply-demand theme...decline in union participation could also come as a result of bad experiences with unions over leveraging their positions causing business to prefer non-union workers. At the same time, as working conditions improved the benefits of participating in a union could be much less pronounced. Meaning that demand for non-union workers increased, which were in ample supply. To truly make a case for union participation you have to also make a case for how hiring union workers benefits a business. If that isn't plainly obvious, then the demand for union workers themselves will go down.