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There are approximately 150,000 to 160,000 employers in New Zealand , and many of them are small businesses with fewer than 10 employees . For example , the North American Industry Classification System ( NAICS ) code 213 , Support Activities for Mining ( which includes actual drilling and support activities for mineral , oil , and gas wells ) contains over 7,600 firms ; 98 % of them are small businesses . While transient laborers make claims of the quality and expediency of their work for a low cost , the majority of them use questionable business practices .