Would the numbers reflect the same if restaurants increased had their contingent of undocumented and thus undeclared workers? For example: If I perviously had

Would the numbers reflect the same if restaurants increased had their contingent of undocumented and thus undeclared workers? For example: If I perviously had 1 server, then brought in a second one which is not on the books at all and I pay under the counter in cash, would it show up as a productivity increase of my still official single employee?