On the grid provided below, sketch the total revenue, marginal revenue and marginal cost curves. Hint: Output (Q) should be on the horizontal axis.

• Start at the origin (0,0).
• Draw a curve that initially increases, reaches a maximum point (e.g., around Q=6 or 7, with TR around 80-90), and then begins to decrease. This curve typically has an inverted U-shape.

• Draw a downward-sloping line.
• It should start at a positive value on the vertical axis (e.g., around 15-20 for Q=1).
• The MR curve should intersect the horizontal axis (Output Q) at the same output level where the Total Revenue (TR) curve reaches its maximum.
• Continue the MR curve into the negative region after it crosses the horizontal axis.

• Draw a U-shaped curve.
• It typically starts relatively high, decreases to a minimum point (e.g., around Q=3 or 4), and then rises sharply as output increases.
• The MC curve will generally intersect the MR curve at some point, which represents the profit-maximizing output level.

The exact numerical values for the curves are not given, so the sketch should focus on illustrating these characteristic shapes and their relationships on the grid.