Table 4

The quadratic conditional Engel curve

Independent variables	Food	Health	Education	Housing	Clothing	Entertainment	Durable goods	Alcohol	Energy and Electricity
Dummy variable for tobacco spending (d)	−1.1126	−0.1049	−0.2221	0.2825	−0.0219	−0.2067	1.7532	0.0576	−0.1203
Dummy variable for tobacco spending (d)	−0.7395	−0.4335	−1.1768	−0.3019	−0.0837	−0.2295	−1.3449	−0.2041	−0.5409
Total amount of tobacco spending (q)	0.0293	−0.0234	−0.0710***	−0.0164	−0.001	0.0106	0.0450**	0.0129***	0.0333**
Total amount of tobacco spending (q)	−0.0257	−0.0148	−0.0253	−0.0136	−0.004	−0.0071	−0.0227	−0.0044	−0.0139
Log of total expenditure (lnM)	−0.1447**	0.1554***	0.0127	−0.0433	0.0043	0.0159	−0.2039**	−0.0066	−0.0182
Log of total expenditure (lnM)	−0.0734	−0.0343	−0.0452	−0.061	−0.0088	(0.0169))	−0.0812	−0.0067	−0.0247
Square of (log) total expenditure-(lnM)²	0.0029	−0.0064***	0.0001	0.0034	−0.0004	−0.0004	0.0106***	0.0002	−0.0006
Square of (log) total expenditure-(lnM)²	−0.0032	−0.0014	−0.0019	−0.0027	−0.0004	−0.0007	−0.0036	−0.0003	−0.001
Interaction term (d × lnM)	0.207	−0.0063	−0.018	−0.056	0.0043	0.0437	−0.2735	0.0025	0.0513
Interaction term (d × lnM)	−0.135	−0.0778	−0.2085	−0.0958	−0.0154	0.0413)	−0.2398	−0.036	−0.0958
Interaction term (d × lnM)²	−0.01	0.0016	0.0042	0.0029	−0.0002	−0.0024	0.0098**	−0.0008	−0.004
Interaction term (d × lnM)²	−0.0064	−0.0036	−0.0093	−0.0045	−0.0008	−0.0019	−0.0107	−0.0016	−0.0043
Sample size	9391	9391	9391	9391	9391	9391	9391	9391	9391

The study focuses on the effect of tobacco expenditure on spending for other goods, so the coefficients of household characteristics are not reported.
All commodity groups are considered as a dependent variable.
*, ** and *** show significance levels at 10%, 5% and 1%, respectively.