The Economic Manufacturing Quantity Model $($EMQ$)$:$?$

$-$Relaxes the instantaneous replenishment assumption by allowing usage or partial delivery during production.

$-$is used to process several models of the same product requiring machine reprogramming and tool changes.

$-$is used when customer demand is relatively low and lead times are long.

$-$relaxes the constant unit price assumption by allowing purchase quantity discounts.