Think about Fed or other Central Bank. They can print money whenever they want - and control the "local" economy jusy by adding extra cash in the system or lower the interest rate. As a matter of fact the value of its money is cheaper so citizen can spend it more. BUT be aware that system is controlled by an authority!!! Are you sure you can trust them ?
When the money printed is too much the entirety economy goes down because of inflation of hyper-inflation ( see what's happening in Venezuela ) and what you own is just a bunch paper with some ink on it.
So thanks to its definited amount ( 21 MBTC) , BTC will never be influenced by inflation and yet it can only growths its price.
The issue is that profits from mining new bitcoins is continuously decreasing (and will reach 0 in 2140, when all bitcoins have been mined), while cost of mining is increasing. So to keep miners mining (because without miners the whole system breaks down), they need to be paid somehow otherwise. This is where transaction fees come in, but it's in my humble opinion also the most problematic part (next to lack of scalability) of bitcoin. The more you pay, the faster your transaction will be processed, the less you pay the slower (or possibly never if you are unlucky) is your payment processed. This means for your payments to be timely processed, you'll have to pay a sizeable amount of transaction fees, as you don't have a guaranteed transaction time, but have to pay for it. Just imagine you: timely pay your rent, but don't pay a high transaction fee (possibly because you simply can't afford it) and get thrown out of your appartment, because the transaction was simply not processed (or not fast enough) because of it and you not willing (or able) to pay a premium for fast processing. So in a very problematic situation you might be forced to offer transaction fees, that would make the interest of a loan shark look like a good deal, just to make your payment work.
