Its curve shifts to the right with an increase in income or preference, and it generally has negative slope when plotted against price.  
The Markovian type has been used to model inventory control, where dynamic pricing is optimal over fixed pricing.  Another type may satisfy the weak axiom of revealed preference and is said to be homogeneous of degree zero.  That type, Walrasian, is linked via the Slutsky decomposition to another type based on the substitution effect, Hicksian.  Its cross elasticity is positive for substitutes and negative for complements, while its income elasticity is positive for normal goods and negative for inferior ones.  Its curve shifts to the right with an increase in income or preference, and it generally has negative slope when plotted against price.  FTP, name this willingness and ability of buyers to purchase a good.
The Markovian type has been used to model inventory control, where dynamic pricing is optimal over fixed pricing.  
demand