As Singapore's economy continues to contract and with the fourth budget incoming, is it likely that share prices will continue to drop? How will investors likely be affected?

My advise is, ignore all these external factors. Do your own due diligence in getting to know the company fundamentals. If the fundamentals is good, they dont need to rely on these govt support. Although the govt support will definitely aid them in recovering faster.

On the other hand, if companies are depending on these support grants to survive, regardless how cheap the stock is, you should stay away. There's a limit to how much the govt can assist. If the fundamentals are weak, regardless of the support, it wouldn't go far.

Lastly, if you had did your due diligence, just do monthly/quarterly DCA to avoid timing the market. As long as the fundamentals are strong, over long period of time, it will definitely be profitable.