Historical and cultural understanding of the Jews customs is essential
to interprete the Gospel.
One talent is equel to eighteen years work.
This master reap where he sowed not, and gather where he have not strawed. Secondly, he even disgraced his servant with one talent by taking it away to give it to the one with more. The master tried to praise the one that earn more by discrediting another.
The master entrusted the talents to the servants. He asked them to look after the talents. He did not asked them to invest the talents. What if the servants lost their talents in their investment? How would the master treat the servants in this case?
In our age, when one entrust his money to me and if I help to invest, I would be committing a criminal breach of trust.