Well, it's not always like that and manufacturers don't increase the prices of their manufactured goods without any reason but they increase the prices when the cost of manufacturing increases. You need to understand that manufacturing companies have to buy goods and materials as well that they use to manufacture their products and then sell them to retailers or store owners and then those retailers and stores sell them for a higher price along with their profit and all the costs.
The reason behind the rise of inflation in a country is its bad economic conditions and economic conditions can only be improved by the government, they are the ones who need to make plans and do things that would make the economy better and more stable so that inflation within the country can reduce over time and people don't face much problems.