Williams Accumulation/Distribution (Williams AD) Accumulation is a term used to describe a market controlled by buyers;
 whereas distribution is defined by a market controlled by sellers.
 Williams recommends trading this indicator based on divergences:
  Distribution of the security is indicated when the security is making 
  a new high and the A/D indicator is failing to make a new high. Sell.
  Accumulation of the security is indicated when the security is making 
  a new low and the A/D indicator is failing to make a new low. Buy.
