I think that Caplan is referring to a scenario in which the UBI is high enough to cause a significant reduction of the employment rate.
1000 $ per month would not achieve this effect.
By the way, here in Italy the state has recently enacted a law to give 780 € per month to unemployed people. The party which proposed this law has been mostly voted by southern Italy, whose ruling classes correctly predicted that it would have had the effect of increasing undeclared work.
I think that Caplan is referring to a scenario in which the UBI is high enough to cause a significant reduction of the employment rate.
1000 $ per month would not achieve this effect.
By the way, here in Italy the state has recently enacted a law to give 780 € per month to unemployed people. The party which proposed this law has been mostly voted by southern Italy, whose ruling classes correctly predicted that it would have had the effect of increasing undeclared work.