Roy B. Kester, Accounting theory and practice… (1922)
“ Without doubt the most important single factor in the determination of the depreciation rate is the normal policy as to repairs and maintenance. Physical deterioration is constantly at work. If this is counteracted by a liberal maintenance policy, not only is more efficient service secured but a longer service life is thereby insured. As soon as repairs are needed, although the efficiency of the asset may not be immediately impaired, the rate of deterioration is much accelerated unless the condition is corrected. ”
