The chart shows the marginal revenue of producing apple pies.
 ┌──────-┬──────┬──────┐
 │ Pies │ Total │ Marginal │
 │ produced │ revenue │ revenue │ 
 │ per day ├──────┼──────┤
 │ 0 │ ── │ ── │
 │ 1 │ $10 │ $10 │
 │ 2 │ $20 │ $10 │
 │ 3 │ $30 │ $10 │
 │ 4 │ $40 │ $10 │
 │ 5 │ $50 │ $10 │
 │ 6 │ $60 │ $10 │
 │ 7 │ $70 │ $10 │
 └──────--┴─────-┴──────┘
According to the chart, the marginal revenue
❌ A) decreases by ten dollars as production increases.
❌ B) increases by ten dollars as production increases.
❌ C) falls to zero dollars as production increases.
✔️ D) remains the same as production increases.
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