This passage demonstrates use of first person narrorator where the character tells the story. why did the author use this writing style

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.

explanation:

this is anne frank, correct?