Concrete structures are generally more expensive than brick structures. This is primarily due to the higher cost of materials, labor, and construction techniques involved in concrete construction. According to the National Association of Home Builders (NAHB), the average cost per square foot for a concrete home is around $100 to $150, while the average cost per square foot for a brick home is around $70 to $100. This discrepancy is influenced by several factors.

Firstly, the materials for concrete construction are more expensive. Concrete requires a mix of cement, sand, aggregates, and water, which can be more costly than the materials used for brick construction. Bricks, on the other hand, are made from clay and other natural materials, which are generally more affordable. Additionally, the process of manufacturing bricks is less complex and requires less energy, further contributing to their lower cost.

Secondly, the labor involved in concrete construction is more intensive and specialized. Concrete requires precise mixing, pouring, and curing, which often necessitates skilled laborers and longer construction times. This can significantly increase the overall cost of the project. In contrast, bricklaying is a skill that can be learned relatively quickly, and brick structures can often be built more rapidly, leading to lower labor costs.

Furthermore, the design and structural considerations for concrete and brick structures also play a role in their cost. Concrete allows for more flexibility in design, as it can be cast into various shapes and sizes. This can lead to more complex and visually appealing structures, but it also requires more planning and design work, which can add to the overall cost. Brick structures, while offering a more traditional aesthetic, may be limited in design complexity due to the nature of the material.

In conclusion, concrete structures are generally more expensive than brick structures due to higher material costs, more intensive labor requirements, and potentially more complex design considerations. However, it's important to note that these costs can vary significantly based on location, specific project requirements, and the quality of materials and labor used.