Wood is generally more expensive than iron when considering the cost of raw materials, processing, and transportation. This is due to several factors that influence the market prices of both materials.

Firstly, the supply and demand dynamics play a significant role. Wood is a renewable resource, but its production is subject to seasonal fluctuations and environmental regulations that can limit the availability. Iron, on the other hand, is a non-renewable resource, but its extraction and processing are more industrialized and can be more easily scaled up to meet demand. As a result, the cost of wood can be higher due to the challenges in maintaining a consistent supply.

Secondly, the processing of wood is more labor-intensive and requires specialized equipment. The process of cutting, shaping, and finishing wood is time-consuming and requires skilled labor, which adds to the overall cost. Iron, while also requiring processing, can be more easily mass-produced using automated machinery, which can lower its cost per unit.

According to the U.S. Bureau of Labor Statistics, the average cost of lumber in 2021 was approximately $3.50 per square foot, while the average cost of steel was around $1.50 per square foot. This data reflects the higher cost of wood compared to iron, even when considering the cost of processing and transportation.

Additionally, the price of wood can be affected by factors such as the type of wood, its quality, and the region from which it is sourced. For example, hardwoods like oak or maple are generally more expensive than softwoods like pine. Iron prices, on the other hand, are more stable and can be influenced by global market conditions, such as changes in steel production or trade policies.

In conclusion, wood is typically more expensive than iron due to the challenges in maintaining a consistent supply, the labor-intensive processing required, and the higher cost of raw materials. While iron production is more industrialized and can be more easily scaled up, the cost of wood remains higher in many cases.