What is the usual spacing in the body of a letter?

The standard spacing in the body of a letter is single-spaced. This formatting choice is commonly used because it allows for clarity and saves space, making the letter more concise and easy to read. The single spacing ensures that the text is packed closely enough without appearing cluttered, which is essential in professional correspondence. It also allows for easier reading and a more polished presentation of the letter, aligning with conventional business practices and improving communication effectiveness.

In contrast, options like double spacing would create excessive white space between lines, which is generally not preferable in business writing. Likewise, 1.5 spacing, while more readable than double spacing, is not a standard practice for most letters, as it can again take up unnecessary space. Triple spacing would be highly uncommon and make the letter appear far too loose and unprofessional. Standardizing to single spacing helps maintain a professional tone throughout the communication.