Openness to loans has been called a "characteristic feature" of the Albanian language. The Albanian original lexical items directly inherited from Proto-Indo-European are far fewer in comparison to the loanwords, though loans are considered to be "perfectly integrated" and not distinguishable from native vocabulary on a synchronic level. Although Albanian is characterized by the absorption of many loans, even, in the case of Latin, reaching deep into the core vocabulary, certain semantic fields nevertheless remained more resistant. Terms pertaining to social organization are often preserved, though not those pertaining to political organization, while those pertaining to trade are all loaned or innovated.