Durkheim identifies 4 basic types of suicide. Anomic [economic] suicide occurs when individuals are out of touch with society & become isolated.
Similarly, egoistic suicide occurs when people are unable to find a "basis," or a reason to continue to live their day to day lives, usually due to isolation. Society does not adequately "regulate," or intervene in individual lives by providing structure, purposeful employment, recreation, &/ or self-actualization in general.
Both types of suicide occur in modern industrial society [more often] during both economic boom & bust. During good economic times, people can become suicidal when they perceive others are doing so much better financially, that their own insatiable [greedy] nature is so unfulfilled, that life become no longer worth living.
Altruistic suicide occurs when [usually religious] individuals consider their existence to "be situated beyond life itself, i.e. the afterlife. Like suicide bombers, who believe they will obtain virgins in heaven for murdering innocent people upon their suicide.
Finally, suicides termed "crisis of widowhood" occur upon the death of a spouse, or a loved one. The suicide victim finds him or herself in a totally new [lonely] living "situation", and are no longer able to cope with the rigors of life without their significant others(s).