At an economics seminar, in response to the current phenomenon of rising domestic consumer prices, experts and scholars participating in the meeting expressed their views. An economist pointed out that the current round of price increases is mainly manifested in rising food prices, and the root cause It lies in excess liquidity, which is manifested by excessive amounts of currency investment. The excess funds need to find investment outlets. Therefore, there is an investment or economic overheating phenomenon. The excess liquidity has hidden risks for the current price rise. Which of the following, if true, can weaken the views of the economists mentioned above? ['The practice has proved that when there is insufficient liquidity in the market, it often leads to oversupply and the consumer price decreases.', 'According to an authoritative survey, 80% of food producers say that rising costs are the reason for rising food prices.', 'The economist has been unknown in the domestic economics circle before.', 'What exactly caused this round of consumer price increases is still under further study.']