Consumer confidence was high before 2008, then shot down from 2008 until even now. But that has been the case for years. Take a look at any graph about it and you'll see the truth in this.
God told them in chapter 8, verses 17-18, "You may say to yourself, 'My power and the strength of my hands have produced this wealth for me'. But remember the Lord your God, for it is He who gives you the ability to produce wealth, and so confirms His covenant, which he swore to your fathers."
I've always found these to be incredible verses. God didn't tell them "if they produced wealth". He said He "gives you the power to get wealth". The scripture doesn't only say that God gave them the power to get wealth, but He also gave them the reason. He gave them the power to get wealth in order to confirm His covenant with them.
His covenant He had made with them was an inferior covenant. Hebrews tells us that we live under a superior covenant with better promises (Hebrews 8:6).
If the covenant you and I live under is a covenant of better promises, then that means that those better promises also include the ability to get wealth.