During the 1920s there was a permanent decline in the price of what?

Labor Militancy, Recession, and Recovery. The Roaring '20s actually began with an economic whimper—the transition back to peacetime after World War I was a difficult adjustment. Labor unions, which had grown strong during the war, fought to maintain their power through a series of strikes in 1919.

Explanation:

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.

what are the options?