A few things to consider.
Year one is basically clean up from the other admin. In this case, there was a great deal to clean up. You would need a team of janitors with mops and shop vacs to make a dent.
The tax cut hasn't even taken place yet, Apple alone is expected to bring back $200 BILLION, there will be north of at least a trillion back into the economy, taxed at 15%, with the remaining apparently in the past of which 30% is directly invested in the business operatio, 70% back to shareholders. I predict, with a booming economy different than in 2004 when this last happened, the number could be 60-40 or even better. Just a lark.
All the cost savings of regulation cuts will be realized also.
Wages. Huge deal. We are hearing over a million Wal Mart employees will see a benefit, we are hearing many more companies getting raises and bonuses, this means more money to be spent in the economy. Helping businesses of all sizes.
Finally, trade deals. They will be better for American, or they won't exist. If they dont exist, this means tariffs, which will not have nearly the harm to consumers as peopel try and suggest, I made the argument for the reasons why before.
You will see 4%+ growth in 2018, 5%+ growth if America walks away from NAFTA
God Bless America! Get 'er done Trump!