For further reading on the topic please see these valuable resources on the Financial Industry Regulatory Authority (FINRA) web site:

Understanding Margin Accounts
http://www.finra.org/investors/understanding-margin-accounts-why-brokers-do-what-they-do

Day Trading Information
http://www.finra.org/investors/markets-and-trading-day-trading-information

Day Trading Margin Requirements: Know the Rules
http://www.finra.org/investors/day-trading-margin-requirements-know-rules

Margin Account Disclosure Statement
http://www.finra.org/file/margin-disclosure-statement-pdf-26-kb

Read more:

Day Trading: An Introduction
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Day Trading Strategies For Beginners
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