Freight costs are determined by the shipping companies market, which in turn is tied to fluctuating supply and demand for goods. There are seasons of high demand for goods, so the demand for transport also rises, and with it the price of freight. There are other factors to consider such as the cost of fuel, which directly affects the bunker, an indispensable input for ships and their movements. External issues such as the closure of some port terminals, congestion on routes, pandemic, wars, are also price triggers.