The Bible speaks in some way to anything you can think of, but it doesn’t speak explicitly to everything you can think of.
In other words, the Bible never uses the term “work ethic,” but it does tell us to do all to the glory of God (1 Cor 10:31). It doesn’t speak about insider trading or the use of DDT, but it does give general commands about cheating (Prov 10:9) and ruling wisely over creation (Gen 1:26–28).
God’s Word has something to say—in at least a general way—about every important issue there is, even if these issues are not mentioned by name.
The same goes for the controversial subject of abortion.