A Margin Requirement is the percentage of marginable securities that an investor must pay for with his/her own cash. It can be further broken down into Initial Margin Requirement and Maintenance Margin Requirement.
<span>Reaction time<span>, which can either be
simple or complex refers to the time
needed for perception and evaluation of a stimulus and the time necessitating a response. A </span></span><span>complex reaction time
involves selecting a specific and correct response from several choices when
presented with several different stimuli.</span>