urban economy through providing livelihoods for 
low-income groups.  
Along with the development of the urban 
planning system especially in developing countries, 
the real setting of the HBE needs to be included, 
because it provides a local service facility. Kellett 
(2000a) emphasised that HBEs are not only for 
income generation, but also have a role as a local 
service facility within a neighbourhood. The role of 
HBEs as local service facilities suggests that HBEs 
need to be supported and accommodated in the urban 
plan. 
2.1.4. Housing Policy Perspective  
In perspective of housing policy, the benefits of HBEs 
go beyond income generation and employment and 
the consolidation of housing. They can also 
contribute to upgrading and rehabilitating slums. 
Therefore, there are at least three benefits that can be 
considered in housing policy, as follows: first, HBE 
can be an asset in improving living standards; second, 
by improving living standards, people in low income 
groups can also gradually improve housing 
conditions in a way that has been referred to as 
housing consolidation; and third, their subsequent 
effects are able to improve the wider environment, 
such as through settlement upgrading and 
rehabilitation. 
2.1.5. Environmental Effects Perspective  
Some researchers argue that the informal sector, 
including HBEs, is assumed to be a problem for the 
environment. In fact, the domestic activities of the 
household such as cooking, sweeping, vacuum 
cleaning, painting, and redecorating can cause the 
release and spread of indoor pollutants at home. 
Those impacts will be worse if the household is 
occupied in motor servicing, small restaurant, or craft 
production. However, Perera and Amin (1996) and 
Tipple (2005a: 296) (Tipple, 1999) state that the 
negative impacts (pollution) on the environment of 
informal sector activities, including HBEs, are 
minimal.  
2.1.6. Spatial Implication 
The spatial implications of HBEs are related to the 
configuration of space, spatial organization, 
territoriality, and boundaries. Bishop and Kellett state 
that:  the line and boundaries between reproductive 
and productive activities are managed through a 
complex, culturally-embedded mechanism in which 
individuals, households and groups are continuously 
negotiating and re-negotiating the relations and 
boundaries between themselves (2000: 54).  
The boundaries of the area for business and 
domestic use are largely determined by culture. 
According to Kent (1991), spatial boundaries, both 
conceptual and physical, are continuously changed 
and varied, differing from one culture to the other.  
 
2.2 Adaptation Strategy 
In numerous fields of social science, adaptation is 
considered as a response to risks relating to the 
interaction with environmental change, particularly 
changes in the physical environment such as in 
dwellings, urban areas, the state, or the world. 
Humans basically face the same adaptive challenges 
as all organisms, but humans are more varied because 
of different cultural influences. Human adaptation 
depends on cultural adaptation. 
The descriptions of coping strategies so far have 
placed the emphasis on general applications, while 
Berry (1980) proposes a model with three basic 
elements of ecology, culture, and behaviour. Bearing 
in mind harmonious coexistence between the three 
elements, Berry (1980) formulates three adaptation 
strategies for coping with changing environmental 
conditions: adjustment, reaction, or withdrawal. 
In the context of HBE, Tipple and Kellett (2003) 
have identified two categories of adaptation strategies 
which are sharing of space and extending of space 
based on their study in developing countries. In 
additional, Marsoyo (2012) formulate three 
adaptation strategies undertaken by households in 
relation to ‘constructing spatial capital’ in the case of 
HBE, that is (a) the sharing of space, (b) the extending 
of space, and (c) the shifting of space (Figure 2).  
 
Figure 2: The Concept of Adaptation Strategy on 
HBE (Marsoyo, 2012) 
Furthermore, these three categories of space use 
may be grouped into two basic patterns, namely: 
intensive use of space and extensive use of space. 
This grouping gives more detail about the use of 
space based on the physical aspects of the space. 
Thus, the sharing and shifting of space take place