Agency law - is concerned with any "principal"-"agent" relationship; a relationship in which one person has legal authority to act for another. Such relationships arise from explicit appointment, or by implication. The relationships generally associated with agency law include guardian-ward, executor or administrator-decedent, and employer-employee. The law of agency is based on the Latin maxim "Qui facit per alium, facit per se," which means "he who acts through another is deemed in law to do it himself." Agency, in its legal sense, nearly always relates to commercial or contractual dealings. .

             Antitrust- To prevent trusts from creating restraints on trade or commerce and reducing competition, Congress passed the Sherman Antitrust Act in 1890. The Sherman Act was designed to maintain economic liberty, and to eliminate restraints on trade and competition. The Sherman Act is the main source of Antitrust law. The Sherman Act is a Federal statute and as such has a scope limited by Constitutional constraints on the Federal government. The commerce clause, however, allows for a very wide interpretation and application of this act. The Act applies to all transactions and business involved in interstate commerce. If the activities are local, the act applies to transactions affecting interstate commerce. The latter phrase has been interpretted to allow broad application of the Sherman Act. .

             limited liability- the maximum amount a person participating in a business can lose or be charged in case of claims against the company or its bankruptcy. A stockholder in a corporation can only lose his/her investment, and a limited partner can only lose his/her investment, but a general partner can be responsible for all the debts of the partnership. Parties to a contract can limit the amount each might owe the other, but cannot contract away the rights of a third party to make a claim.

             collective bargaining agreement- is the ultimate goal of the collective bargaining process.