https://www.myinvestmentspub.com - Every year due to various International or National factors, the priority of sectors might be changing. For example, from the last few years, the Rupee value is decreasing and this factor making IT and Pharmacy sectors are most favorable sectors. Like wise, the new central government focusing on 'Make in India', this would make Infrastructure sector.. a most favorable sector in the coming days. Based on these factors, the Fund Manager alter the portfolio of his Mutual fund to maintain the performance levels of the Mutual fund. Based on their performance levels, some research firms allocate 5-star, 4-star ratings .