According to Namcook Analytics (Table 16), Smalltalk is one of the most productive programming languages in the world (measured by “economic productivity” in terms of number of work hours to deliver 1,000 function points):

1. C — 26,273
2. Fortran — 22,394
3. JavaScript — 15,929
4. Forth — 14,636
5. Haxe — 14,636
6. Lisp — 14,636
7. C++ — 12,697
8. Go — 12,697
9. Java — 12,697
10. PHP — 12,697
11. Python — 12,697
12. C# — 12,309
13. Dart — 11,620
14. F# — 11,312
15. Ruby — 11,312
16. Erlang — 10,758
17. Elixir — 9,845
18. Haskell — 9,845
19. Julia — 9,465
20. Perl — 9,465
21. Delphi — 8,289
22. Objective-C — 7,848
23. Visual Basic — 7,848
24. Eiffel — 7,156
25. Smalltalk — 6,879

Lisp (and I presume this includes Common Lisp) takes a little more than twice the time that Smalltalk requires to deliver 1,000 function points.