Uber CEO Dara Khosrowshahi and Lyft cofounders Logan Green and John Zimmer have written an op-ed in which they maintain that flexible employment is essential for their drivers.

The argument follows the passage of a bill in California's state Assembly that could, if passed by the state Senate and signed into law, reclassify ride-hailing drivers as employees rather than independent contractors.

Uber and Lyft can't afford a unionized workforce and argue that employment law should be changed, and that drivers should form an association in partnership with Uber and Lyft.

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Uber and Lyft are the dominant players in the ride-hailing business, but ever since their disappointing IPOs earlier this year, investors have been taking a much closer look at the incipient industry that both companies hope to carve up.

Uber shares have returned to their offering level, but Lyft is down over 20%.

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