1- Can I rely only on bitcoin and not have a bank account specially that I live in a country where bitcoin is unknown?
2- If not.. where can bitcoin be used?
3- If the world Economy collapses, will the value of my bitcoin go down?
4- Does Bitcoin use Usury loans and take interest?
1. its too risky at the moment, you have to have a backup plan. i think btc is more an investment than for daily use today.
2. at stores that accept btc i guess (like newegg )or at gambling, investing.
3. if fiat collapses i think it's natural that you can get more of collapsed currency for your btc
4. not sure, but there are btc loans..