Yes, Duterte will cause the Philippine's economy to crash. He has repeatedly insulted Obama and does not seem to be slowing down. He has proven himself to be an ineffective leader in more than one way. The Philippines should look to elect someone else to avoid many of these failures.
Rodrigo Duterte has shown that he does not really care about the opionions or feelins of other people. He is likely to cause a great deal of harm as long as he continues to say things that are offensive to people who have power, either as individuals or a group.
Rodrigo Duterte will cause the Philippines' economy to crash. His harsh rhetoric towards President Obama has already caused a large dig in their stock market. Investors are pulling out funds based on these statements, and his autocratic actions. He is not acting presidential or diplomatic, and it is affecting his economy.
The reaction to the Duterte's insult to Obama has caused some instability in the Philippine economy. There was a temporary negative effect to the stock market but the economy will rebound. There is an important link between the two countries and they need to remain allies. The U.S. will continue to offer support to the Philippines.
Politics doesn't involve one's emotion when they're playing it, when a politician impose a sanction or a new law based on what they are feeling, it is no longer politics but philosophy. That being said, I don't think Philippines' stock market would crash since Trump is now president, and with President Duterte's foreign policy USA will no longer be their main partner at the upcoming years.
Other's would say that what I am saying is not true, but several news outlets and business journals have pointed out that by 2050 Philippines is already the 16th richest country in the world. By 2020, the country will pay off all the Marcos' debt on the World Bank and if President Duterte's plan for federalism is confirmed, by 2025 the Philippines is now a federal state- this means that every province in the country would have access to fair and equal share of the country's budget and all earnings of that specific province can go to the province itself.
The country would only get better at this point and the only hindrance it might face is civil war, world war, and foreign invasion.