several scholars have found strong evidence for the presence of the local multiplier effect. within tradable industries, enrico moretti discovered that, for each additional skilled job created, 2.5 jobs were also generated in the local non-tradable goods and services sectors, and an additional unskilled job created 1 job in the local non-tradable sector. highly skilled sectors such as technology have the highest multiplier effect with five non-tradable jobs for each technology job. moretti cites the example of apple computers which directly employs only 13,000 workers but generates 60,000 additional service jobs in the area. of those 60,000, 36,000 are unskilled, such as restaurant or retail workers, while 24,000 are skilled jobs such as doctors or lawyers.