• Recode reported on a leaked memo from Amazon raising the alarm about running out of workers from mid-2021.

• An NYT story last year said Amazon executives were worried about this.

• Amazon said in May it is overstaffed now, but attrition is likely still huge at the company, and a union push looms.

Amazon is going to have to do something to avoid potentially running out of workers, according to an internal memo from last year obtained by Recode.

A New York Times investigation from June 2021 found a turnover rate for hourly workers of about 150% each year and reported that Amazon executives were worried about running out of people to hire.

However, this newly leaked memo from that time period provided an in-depth look at Amazon's understanding of its own labor issues and how it might solve them. Insider did not independently verify the memo.

"If we continue business as usual, Amazon will deplete the available labor supply in the US network by 2024," the memo says, according to Recode.

The leaked document "reads like an attempted wake-up call," Recode added.

The memo reportedly says Amazon could use six methods for its warehouse workers, including raising wages or increasing reliance on robots, to fix the issue, but that the problem is coming at the company pretty quickly, especially in certain parts of the country.

Those areas include Phoenix, and the places in and around Memphis, Tennessee, and Wilmington, Delaware.

Another understaffed danger area, the memo said, is the "inland empire" region of California, where the company could potentially run out of interested workers by 2022 because of hiring competition from other logistics companies.

The memo said the models used for those labor predictions were 94% accurate when it came to figuring out where in the US the company would not have enough workers to meet June 2021 Amazon Prime Day-related demand, Recode noted.

The report goes through various solutions, Recode writes. If the company raised wages a dollar, it would see a corresponding increase in the number of people in its hiring pool of 7%, per the memo.