PLEASE ANSWER ALL WITH FACTS AND RELATED ARTICLES. I WILL THUMBS UP IF YOU DO :)

Boy Bili has been purchasing goods and items online. He observed that many online sellers only post the photos of their products but not their respective prices. However, on the comment section, these online sellers simply state - "If interested, PM me for the price." Question: Is this practice in compliance with the requirement of the law? Why or why not? Cite the applicable law/s and the particular provision/s to support your answer. Due to the coronavirus pandemic in the country, the government has long declared a national health emergency. At one point, people rattled and resorted to panic buying of groceries. You are a manufacturer of grocery products and the like. Can you drastically increase the price of these primary commodities during these times of calamity and declared national emergency? Why or why not? Cite the provision/s of the law that will support your