However, security or trust issues the decentralization of digital currency and the absence of insurance provided by governmental authorities may prevent digital currency from being used as a store of value. Instead, digital currency may be used as a medium of exchange dominantly.
Do you agree with this research result?
Not at all. The majority of people I know that use bitcoins don't spend them ever or rarely spend them. I don't have anywhere local that accepts bitcoins and I don't trust online stores that accept them, so it's almost exclusively a store of value for me.