Fig. 1: The number of mathematics Ph.D. degrees awarded from 150 US math departments (green solid curve) and the number of people who later became doctoral-granting (DG) faculty members from this pool (blue dotted curve) between the years 1900 and 2019. | Humanities and Social Sciences Communications

Fig. 1: The number of mathematics Ph.D. degrees awarded from 150 US math departments (green solid curve) and the number of people who later became doctoral-granting (DG) faculty members from this pool (blue dotted curve) between the years 1900 and 2019.

From: Temporal dynamics of faculty hiring in mathematics

Fig. 1: The number of mathematics Ph.D. degrees awarded from 150 US math departments (green solid curve) and the number of people who later became doctoral-granting (DG) faculty members from this pool (blue dotted curve) between the years 1900 and 2019.

The steep decline beginning in 2010 is simply an indication of the necessary time lag between receiving one’s Ph.D. and graduating one’s first Ph.D. student.

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