It has become far normal for people to live alone, particularly in metropolitan areas in the developed world. From my perspective, I firmly agree that the demerits of solitary lifestyle prevail over its possible merits.
First of all, property prices and rents will inevitably arise if more and more people choose to live on their own. To be specific, living a solitary lifestyle can increase pressure on housing shortages, while there is not enough space to build more houses in a limited urban area. As a result, a rise in demand for housing is likely to push up property prices and rents. A survey conducted by 'TIMES NOW' reported that Shenzhen property rates have been increased by 35% in the last 5 years due to the increase in the number of people living alone.
In addition, the increasing trend of living alone has a direct relationship with the percentage of people suffer from psychological problems these days. In other words, living alone creates loneliness and depression, unlike the traditional family where there are always others to share someone’s distress and sadness. Tolerating negative emotions alone often leads people to become introverted, egoistic and eccentric. A recent Shenzhen University study reveals that single-person family members who saw a psychiatrist increased by 20% over last year.
In conclusion, the increase in one-person households has more detrimental effects on the development of the society because that it may not only cause house prices to rise but also it is negative to people's mental health. 
It has become far normal for  
people
 to  
live
  alone
,  
particularly
 in metropolitan areas in the developed world. From my perspective, I  
firmly
  agree
 that the demerits of solitary lifestyle prevail over its possible merits. 
First of all
, property prices and rents will  
inevitably
 arise if more and more  
people
 choose to  
live
 on their  
own
. To be specific,  
living
 a solitary lifestyle can increase pressure on housing shortages, while there is not  
enough
 space to build more  
houses
 in a limited urban area.  
As a result
, a rise in demand for housing is likely to push up property prices and rents. A survey conducted by 'TIMES  
NOW
' reported that Shenzhen property rates have  
been increased
 by 35% in the last 5 years due to the increase in the number of  
people
  living
 alone. 
In addition
, the increasing trend of  
living
  alone
 has a direct relationship with the percentage of  
people
 suffer from psychological problems these days.  
In other words
,  
living
  alone
 creates loneliness and depression, unlike the traditional family where there are always others to share someone’s distress and sadness. Tolerating  
negative
 emotions  
alone
  often
 leads  
people
 to become introverted, egoistic and eccentric. A recent Shenzhen University study reveals that single-person family members who  
saw
 a psychiatrist increased by 20% over last year. 
In conclusion
, the increase in one-person households has more detrimental effects on the development of the society  
because
 that it may not  
only
 cause  
house
 prices to rise  
but
  also
 it is  
negative
 to  
people
's mental health.