Please discuss the bargaining power of suppliers for Supermarkets and Grocery Stores in Australia's industry.

For example like are there barriers to entry in your chosen industry? That is, is it difficult for new firms to enter or is there free entry? Have any significant new firms entered the industry in the recent past? Consider how brand loyalty, economies of scale, intellectual-property law (e.g. patents and copyrights), and government regulation can each contribute to barriers to entry.