What is the foundation of any labor management relationship​

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Effective labor-management relationships include bargaining in good faith, a requirement of the NLRA. The act states that employers and labor unions must engage in a collective bargaining process that will result in a labor union contract to which both parties, plus union members, can agree.

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explanation:

a progressive tax is a tax that imposes a lower tax rate on low-income earners compared to those with a higher income, making it based on the taxpayer's ability to pay. that means it takes a bigger percentage from high income earners than it does from low income people.