The difference between the cost price and the retail price of merchandise. Markup may be expressed in dollars or as a percent. If stated as a percent, it may be based on either cost price or retail price. Most retailers base markup on retail price.
Measure the entire shape of a curved shower rod if this is the style you have. Expect the measured width to be approximately 6 inches more than a standard curtain rod. Purchase a shower curtain with a 72-inch width, if available, to compensate for the additional width. If necessary, a 70-inch curtain width works as well. This is because the rods curve inward at the edges, making for an overall smaller width measurement.
Shower curtains can be decorative with a liner, or multipurpose. For multipurpose curtains that hang inside the tub when in use, the hem must be 1-2 inches from the floor of the tub. Curtains hung too low can get stepped on, causing rips in the curtain, stress on the rod, and potential slip and fall hazards.