Based on the news about the stock in the past five trading days, please predict the rise or fall of the stock in the next trading day. If the stock is predicted to rise in the next trading day, please output [Rise], if the stock is predicted to fall in the next trading day, please output [Decrease].

Date:2019-08-21, Stock:RIO, The news for the past five days is as follows:
2019-08-14: NEWS1: Is Rio Tinto Set To Increase Its Global Iron Ore Market Share As Vale Falters?.NEWS2: Is Rio Tinto Set To Increase Its Global Iron Ore Market Share As Vale Falters?.NEWS3: Iron Ore Stocks Rise After Goldman Boosts Price Outlook.
2019-08-15: NEWS1: Southern Copper's Tia Maria Construction License Suspended.NEWS2: Southern Copper's Tia Maria Construction License Suspended.NEWS3: Pan American Silver Corp. (PAAS) Ex-Dividend Date Scheduled for August 16, 2019.NEWS4: Pan American Silver Corp. (PAAS) Ex-Dividend Date Scheduled for August 16, 2019.NEWS5: Southern Copper's Tia Maria Construction License Suspended.
2019-08-16: NEWS1: Copper Prices May Take Off as Supply Tightens.
2019-08-19: NEWS1: Did Rio Tinto Group's (LON:RIO) Share Price Deserve to Gain 64%?.
2019-08-20: NEWS1: Is iShares Edge MSCI Multifactor Intl ETF (INTF) a Strong ETF Right Now?.NEWS2: Is iShares Edge MSCI Multifactor Intl ETF (INTF) a Strong ETF Right Now?.NEWS3: BHP Should Stand Pat on Copper.

Answer: Decrease