The problem states that domestic beef producers face a demand of $QD = 1000 - 5P$. The Chinese then acquire a taste for U.S. beef, resulting in their demand being $QD = 500 - 5P$. We need to find the new market demand.

1. Problem Description

The problem states that domestic beef producers face a demand of $QD = 1000 - 5P$. The Chinese then acquire a taste for U.S. beef, resulting in their demand being $QD = 500 - 5P$. We need to find the new market demand.

2. Solution Steps

To find the new market demand, we simply add the two demand equations together:

$QD_{market} = QD_{domestic} + QD_{chinese}$

$QD_{market} = (1000 - 5P) + (500 - 5P)$

$QD_{market} = 1000 + 500 - 5P - 5P$

$QD_{market} = 1500 - 10P$

3. Final Answer

The market demand is $1500 - 10P$ for all P.

So the answer is d.