The cleaning services industry brings in more than $50 billion a year, from commercial janitorial services to residential cleaning agencies, and the industry is projected to continue growing as the baby boomer generation continues to age and older Americans seek help with housework.

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Alex E

Ecoclimax is defined by Odum (1969) as the culmination state after a succession in a stabilized ecosystem in which maximum biomass (or high information content) and symbiotic function among organisms is kept per unit of available energy flow.