Non-profit organizations have invested a great deal of money to build shelters for homeless people in large cities  However, not even one city has been able to build enough shelters for their homeless populations, and people are becoming homeless faster than shelters are being built  More of the money invested by non-profit organizations should be used in the future to prevent people from becoming homeless
Because preventing homelessness is more efficient than building shelters for homeless people, it is imprudent that the amount of money set aside for prevention of homelessness is less than the amount spent to build just one shelter
It is the claim that the argument as a whole is designed to sustain.