Answer:
The Labor Party was an American social democratic political party advocating workers' interests. The party was formed in 1996 by the United Mine Workers, International Longshore and Warehouse Union, American Federation of Government Employees, California Nurses Association, and hundreds of other local labor unions.
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I believe the answer is: positive externality
Positive externality refers to The benefit that enjoyed by a third party when the first and second party are conducting a transaction.
When you receive a vaccines, you prevent yourself from becoming a host that could contaminate other people from getting the virus. In the example above, you and your children are the first and second party. And other children are the third party.
Riis states that if the nation does not wipe out slums, the slums will wipe out.
He see the battle against slums as a battle with poverty. He states that the battle must be won as fasts as possible, stating that the slums are the enemy of civilization.