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Grand pianos are expensive primarily due to their large size and the use of high-quality materials in their construction. They are also much more labor-intensive to build compared to upright pianos or digital keyboards.

The larger size of a grand piano allows for a longer string length, which produces a better sound quality. It also provides a larger soundboard, which contributes to a richer and louder sound. However, this means that more materials are needed, and the manufacturing process is more complex and time-consuming.

Grand pianos often use high-quality hardwoods for the frame and soundboard, which are expensive but provide better sound transmission and longer lasting instruments. The action mechanism, which is the part of the piano that controls the keys and hammers, is also more complicated in a grand piano and requires more precise and high-quality parts.

Additionally, grand pianos are generally built by hand, which adds to