1)
What is the meaning of "Hibok Tibok"?
1.
Rashi: [The land] will be emptied. Malbim - this explains why there will be no mastery and authority.
2)
What is the meaning of "Hiboz Tiboz"?
1.
Rashi: It is an expression of Bizah and Shalal (it will be plundered). Malbim - this explains why there will be no monetary superiority. All the money will be taken, and all will be impoverished.
3)
Why does it say "Ki Hashem Diber"?
1.
Radak (according to Kli Paz' text): Since He said so, a person can definitively say that it will be so.
2.
Malbim: Nothing that He said will be in vain (all will be fulfilled).
