'''Legal barriers to entry''' are barriers to entering a market caused by a government law preventing competition. For example, if the government lobbies state legislatures to require a vaccination for all children, competing vaccines are barred from entering the market because everyone is already made to use the first vaccine. | '''Legal barriers to entry''' are barriers to entering a market caused by a government law preventing competition. For example, if the government lobbies state legislatures to require a vaccination for all children, competing vaccines are barred from entering the market because everyone is already made to use the first vaccine. |