Changes in the valuation of this caption allowance for doubtful accounts in 2017, 2016 and 2015, were as follows:
| 2017 | 2016 | 2015 | ||||||||||||||
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Allowances for doubtful accounts at beginning of period |
Ps | 2,196 | 2,152 | 1,856 | ||||||||||||
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Charged to selling expenses |
252 | 556 | 434 | |||||||||||||
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Additions through business combinations |
141 | — | — | |||||||||||||
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Deductions |
(449 | ) | (867 | ) | (276 | ) | ||||||||||
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Foreign currency translation effects |
5 | 355 | 138 | |||||||||||||
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Allowances for doubtful accounts at end of period |
Ps | 2,145 | 2,196 | 2,152 | ||||||||||||
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