Why do people attribute economic indicators to a sitting politician.

Figures such as unemployment rate, wages, the price of goods and GDP are affected by many things: The global economy, federal Bank policy on interest rates, decisions by local politicians and constraints within a long existing political consensus.

That there is economic growth under Trump is not proof of sound decision making on his part. In the same way, the low price of gas under Obama was never down to him but due to the global collapse in crude oil price.

Economic indicators are the results of things lasting years or decades. They can be down to decisions by a sitting leader but you have to demonstrate how. Where is the causality?