Birch wood is generally less expensive than oak wood when it comes to beds. This is due to several factors that influence the cost of both materials.

Firstly, oak is a more durable and heavy-duty wood compared to birch. Oak trees are slower-growing and harder, which makes them more suitable for furniture that requires strength and longevity. The demand for oak furniture, especially in high-end markets, is higher, driving up its price. Additionally, oak is more challenging to work with due to its dense grain, which can increase labor costs during the manufacturing process.

On the other hand, birch wood is lighter and easier to work with. It has a fine grain and is more uniform in texture, making it more accessible for mass production. Birch is also more abundant, which contributes to its lower cost. These factors make birch a more cost-effective choice for bed manufacturing.

According to the American Hardwood Export Council, the average price per board foot for oak is around $4.50 to $6.50, while birch ranges from $2.50 to $4.50. This data highlights the significant price difference between the two woods.

Furthermore, the availability of birch in the market also plays a role in its affordability. Birch trees are more commonly found in North America, making it easier to source and transport. In contrast, oak trees are less abundant, and their distribution is more limited, which can increase transportation costs and contribute to higher prices.

In conclusion, birch wood is more expensive than oak wood for beds due to its lighter weight, ease of use, and abundance in the market. Oak's durability, strength, and higher demand make it a premium choice, thus justifying its higher price point.