In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Imaam As-Sadi [may Allaah have mercy upon him] said:
Islam commanded that knowledge of trade and economic matters are learnt, to the extent that it commanded that young orphans are observed, taught how to engage in trade and seek earnings. Allaah [The Exalted] said: [وَٱبۡتَلُواْ ٱلۡيَتَـٰمَىٰ حَتَّىٰٓ إِذَا بَلَغُواْ ٱلنِّكَاحَ فَإِنۡ ءَانَسۡتُم مِّنۡہُمۡ رُشۡدً۬ا فَٱدۡفَعُوٓاْ إِلَيۡہِمۡ أَمۡوَٲلَهُمۡۖ – And try orphans (as regards their intelligence) until they reach the age of marriage; if then you find sound judgement in them, release their property to them (Surah An-Nisaa Aayah 6)]. Islam did not order that the wealth of the orphans is given to them until the guardian is knows (with certainty) regarding their rationality and their knowledge of the matters related to earning and trade.
Commentary: This is an instruction to the guardian regarding the wealth of an orphan, that the wealth is not left in the hands of the orphan until he (or she) observes and knows the orphan’s mental discernment and good judgement in affairs of wealth. But if it becomes clear to the guardian that the orphan is ignorant regarding buying, selling and how to deal with others, then the wealth would be lost immediately when left under the ophan’s jurisdiction. [From 28mins 32secs to 29mins 50secs. https://www.al-badr.net/detail/3KwCnaB5tN ]