Cash is also known as money, in physical form. Cash usually includes bank accounts and marketable securities, such as government bonds and banker's acceptances. You can buy through it. It is not there to buy goods using directly bitcoin. You need to convert it to become money.
yes you right! cash is good physical form of money it's handy and you can buy anything in an instant while digital currency as bitcoin is digital currency and need network fee and confirmation in every transaction before you can buy.
cash is better than any than bitcoin. we already used cash sense before and bitcoin is new and it is in digital world.