Why is mobility of factors of production general less between the countries than within country?

international-trade
cbse

#1

(i)(Because of legal restrictions on their movement across the nations.
(ii) Variations in sodo-cultural environment of different nations restricts the mobility of labour as it if found difficult to adjust in other country’s sodo- cultural conditions.
(iii)Geographic influences and economic conditions also come in a big way in the movement of factors of production across countries.