Real estate agents often say, “It’s always a good time to buy a house”—because they earn their commission whether or not it’s actually a good time to buy a house.
In the same vein, over at the Wall Street Journal it’s always a good time to increase immigration. The paper’s editorial page—notorious for repeatedly advocating a constitutional amendment saying, “There shall be open borders”—recently ran a column by Jason Riley, a member of the editorial board, entitled “Want to Raise Birthrates? Immigration Is the Key.”
Curiously for a newspaper focused on business and economics, the column contains no numbers to back up this assertion.
Now, falling birthrates are an issue for almost all countries, developed or otherwise. The way this is usually expressed is the total fertility rate, or TFR. This represents the number of children the statistically average woman is likely to have in her lifetime. To maintain a stable population, a nation needs a TFR of slightly above two—one for mom, one for dad, and an additional fraction to account for child mortality.











